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4.3 astro software / downloads

Stellarium
Freeware that renders 3D photo-realistic skies in real time (or here http://www.stellarium.org/)

Google Moon
An interface to help you pay your own visit to our celestial neighbor. Happy lunar surfing.

Celestia
A free real-time space simulation that lets you experience our universe in three dimensions

3D Space Tour screensavers
Animated 3D screensavers with cosmic scenes. Photo-realistic and scientifically correct graphics.

AA+
C++ implementation for the algorithms as presented in the book 'Astronomical Algorithms' by Jean Meeus

ASTRONOM
Planetary information software

ATC Advancede Telescope Control
Telescope control and automated supernovae search

AVIS FITS Viewer
FITS image viewer

Aberrator
Star-testing software that can show all the common telescope defects (astigmatism, coma, pinch, tube-currents, etc.)

Adastra FREESTAR
Accessible free planetarium with multiple viewplanes, accurate reports, live orbital tracking, and astronomical dictionary

Alcyone Ephemeris
An astronomial ephemeris calculator covering the period 3000 BC to AD 3500 that calculates heliocentric, geocentric, and topocentric positions and much more

Astro
French astronomy program, especially for Dobson's owners

Astroart
Image processing for astronomical images

AstroSnap and AstroSnap Pro
AstroSnap (Freeware) and AstroSnap Pro (Shareware) are two astronomical imaging programs especially designed for webcams

AstroGrav
Allows you to study how astronomical objects move and interact under the force of gravity

AstroCalculator
Optical and Imaging calculator. Use for all aspects of Astrophotography from imaging characteristics, resolution to exposure and more.

AstroMB
Manage astronomical images and catalogs, allow robotic observations, astrometry and photometry

Astromist
Palm OS astronomy tool which helps you to organize your observation session

AstroExcel
Free astronomy Excel spreadsheet calculations and graphs

Astrometrica
Software for doing astrometry of Minor Planets

Astronomer's Digital Clock
Displays time, date, and Julian day

Astra Image
Image processing for astronomical images

Astronomy Calculator
Provides sunrise, sunset, moonrise, moonset and lunar phase information for any location on Earth

Astro Timer PPC
Pocket PC Software designed for recording the timings of lunar grazings, ocultations, transits, meteor showers and any other astronomical observation that needs a record of the date and time to the nearest 10th of a second.

AstroPlanner
Astronomical observation planning, logging and telescope control software

AstroCalc
Calculates the position of planets and give their appearance

AstroGemini Screen Savers
Astronomy screen savers

Astronomical Observation Log
Log down your observations and import a pic or sketch of the object your observing.

AstroStack
Free program that takes a series of video images and combines them into one

AutomaDome
Dome control software

Best Pair
Software for picking the two best stars for auto alignment with Meade & Celestron scopes

Bentec Services Limited
Free software for hyperaspherical optical design

Binary Maker
Accurately calculates light and radial velocity curves for almost any type of binary, simultaneously displaying the theoretical and observed curves as well as a 3-D model of the orbiting stars

C88
An informational tool for amateur astronomers

CADET
Image processing program specific to astronomical images that supports FITS, Bitmap and JPEG formats

CCDOPS
SBIG CCD camera control software

CCDSoft
Combines both CCD camera control functions and astronomical image processing functions into a single package

CCD Astrometry
Software for doing astrometry of Minor Planets

CLEA
Windows Software Modern Laboratory Exercises in Astronomy

CNebulaX
Freeware. Deep sky astronomy software for star charts with 25 million stars and 1.25 million deep sky objects.

Cartes du ciel
Free sky atlas for windows that provides access to catalogs and photographs (Sky charts in english)

Celestia
A free real-time space simulation that lets you experience our universe in three dimensions

Celestial Maps
Sky atlas for windows and DOS

Charon
Minor planet astrometry software

Circe
Astrometrical software for minor planets and comets

CoolSky
Sky simulator for amateur astronomers that uses OpenGL technology

Coeli - Stella 2000
Real-time Windows planetarium with logbook, telescope control, and 3 integrated encyclopedic reference works.

CyberSky
Colorful, easy-to-use planetarium program

Free PDF Star Charts Dan Bruton, SFA Observatory

Dan's Astronomy Software
Jupiter, Saturn, and eclipsing binary star programs

DarkAdapted
Modifies your screen gamma settings so that you may preserve your dark adaptation while using your computer

DeepSkyStacker
Freeware for astrophotographers that simplifies all the pre-processing steps of deep sky pictures and is specialized in dealing with RAW files from DSLRs. TIFF, JPEG, BMP and PNG files are also supported

DeskMoony
Calculates current moon phase and draws it nicely.

Deepsky Free
Deepsky Free is the free version of Deepsky Astronomy Software

Delphinus
Freeware designed to control Canon DSLR Cameras by Serial Port (RS-232)

designerSKY
Planetarium like starchart

Deepsky
Observining and planning software for observers, telescope control, log book, control panels

Desktop Universe by Main-Sequence Software
The fusion of a full-color photographic star atlas with a desktop planetarium program

Deep Sky Database
Online resource for building customized observing lists

Deep-Sky Planner
Observation Planning & Logging Software for Astronomers

Desktop Lunar Calendar
Desktop Lunar Calendar is simple, fun and easy to use calendar. It is accurate anywhere in the world.

Dimension 4
Time synchronization utility

Digital Universe
Advanced astronomical simulator

Drift Scan Imaging
Drift scan software for CCD cameras

Earth Centered Universe Pro v4.0
Planetarium and telescope control program designed for the requirements of amateur astronomers and professionals alike

Eagle Lander 3D
Authentic simulation of the Apollo lunar landings and includes accurate renditions of scenery, flight dynamics and the lunar module

EasySky
Star charting (planetarium software), 3D solar system, and animations

EarthDesk
Real time rendered Earth desktop with sunight, moonlight and clouds

Eclipsing Binary Simulator
Visualise the orbit and synthetic light curve of binary star systems

EfeCalc
Calculates the position, rise times, and set times of the Sun, Moon, Planets, Stars; Solar and Lunar Eclipses (with maps generation)

Encyclopedia Galactica
Planetarium software, explore the moon features, 3D solar system

Esquire Nautical Almanc
Fully operational almanac

Find Orb
Computes orbital elements from observations

FlashSkies
Online Flash Planetarium for every Browser

Focus Corrector
ActiveX image processing software, sharpens images

GeoFusion Mars demo
The GeoPlayer Mars program allows you to explore the Red Planet from outer space to deep in Valles Marinaris. You can fly through valleys and over craters on desktop PCs and laptop computers with a graphics accelerator This is a free low resolution version of a the GeoFusion CD.

GrandTour
Simulate space as seen from the Voyager and Giotto spacecraft

Gravitation3D
Uses OpenGL to simulate star fields, planet trails, sun lighting, gravity wells, and much more

Guide
Star Charting software

Hallo Northern Sky
Planetarium program for Windows

HomePlanet
Astronomy, space, and satellite tracking package

Hr Trace
Free VBA programmed Excel spreadsheets devoted to open cluster study

Hypersky
Computerized star atlas linked to a set of reference works

IRAF
Data analysis

JupSat
Calculates and displays the positions of Jupiter's four main (Galilean) moons

JupView PPC
The positions of Jupiter's satellites, Great Red Spot and a map of Jupiter's features

K3CCDTools
Includes video-capturing, autoguiding, frame aligning and stacking and simple post-processing

Leaving the Cradle
Interactive 3D simulation of Apollo circumlunar flight. Includes 350 MB of planetary textures.

Lunar Globe: the Virtual Museum of lunar vehicles
survey the lunar sphere, lunar formations and other objects without an astronomical telescope

Lunar Phase Pro
Moon observer's toolkit. Contains lunar phenomena predition tools, interactive moon atlas, searchable database of over 9,000 features and many other tools.

LunarPhase
Graphically displays the current phase of the moon and much more

Lunar Co-longitude
Computes co-longitude for dates from 1989 to 2020

Lunar Map Pro
Produces high resolution lunar maps for use at the telescope

Lunar Occultation Workbench
Computes predictions of occultations by the Moon of the planets and stars

MODAS
Modern Optical Design and Analysis Software

Maxclock
High-precision clock, displays sidereal and solar times, equation of time, Julian dates, Delta-T, aequatorial and ecliptic coordinates of sun and moon

Mars MOLA Viewer
View the actual terrain of Mars, at any point on the surface, as a fly-through real-time 3D rendering

Mariner 10 Image Browser and Reconstructor
Software for Mariner 10 TV experiment allows image processing with noise filtering, despeckling, and reconstruction

MaxIm DL
Image processing software

Meteor Observation Log
Log is designed around a 3 hour observation session with the capablity to record up to 20 meteors an hour

MegaStar
Sky Atlas for Windows

Meade Astronomical Software
Telescope control software

Minor Planet Observer
MPO Connection and Canopus

Mira
Image Processing Software

MicroObservatory
An astronomical image processing program that works with FITS and GIF files

Moon Phase Oracle - Solunar Prediction Software
Astronomy software for any location worldwide displays information for any time of day

Moovastar
Proper motion simulation, simulates star positions in the future and past

Moon Map for Pocket PC
A vectorized moon map for the Pocket PC and Palm devices.

Moon Phase Icon
Shows the current moon phase in your system tray

MyStars!
Shareware for stargazers

Newt Telescopes
A newtonian telescope design program that ray traces the telescope checking for vignetting, optimizes diagonal size, calculates baffle size and position, and a lot more

NexStar Freeware
Freeware allowing PC control of all models of NexStar telescopes

Newton's Aquarium
A solar system construction set

NightCal
Produces a single A4 sheet monthly calendar telling the user when it gets dark, when the Moon rises and sets and what the Moon should look like when it does make an appearance

OpTiX
Comprehensive optical design software

Orbitron
Satellite tracking software for visual observers and radio amateurs

Orbit Explorer
Physics educational software for high school and college students and teachers

Orbiter
Freeware space flight simulation and Solar System exploration program with accurate physics, 3D graphics, and a first-person astronaut's perspective.

PEAS - Periodic Error Analyzing Software
Program for evaluation and analysis of periodical errors in equatorial mount

PIXY system 2
Automated astronomical image examination system

PLUCOR.EXE
A freely downloadable Ephemeris program which will print out positions of Sun,Moon and planets

PP3
Free tool for drawing celestial chars in resolution-independent format (PDF)

PRODOBS
Deepsky database written in javascript, allows sophisticated queries, contains sky atlas, finder charts and object-related links to NED, SIMBAD or WEBDA (in german!)

Peranso
Period analysis software for variable stars

Perseus
A vector engine-based planetarium, with USNO2 support, real images 'melt' into the background, 3D graphics for solar system bodies

PinPoint
100% automated astrometric image processing for FITS files from any camera

PlanetWatch
Multimedia guide to our solar system

Planetarium
Displays star charts and other astronomical data on Palmtops

Planet's Visibility and Orbits
Free software along with data on planets, asteroids and stars

Polygon Worlds
Various free software that lets you explore Mars and watch galaxies collide

Power Age Sky Simulator
Planetarium program, a graphic interpretation of the sky

Pocket Stars PDA
A star chart, ephemeris, and Celestial Navigation calculator for the Pocket PC

Practices on Observational Astronomy
Educational software with exercises involving eclipses, saros cycles, and the sky

RSI New Moon
Easy-to-use educational software for middle school through college. 3D views of the Moon's phases, the Solar System, and more.

RTGUI: Windows Real-Time Interactive Astronomy Software
Controls most 'goto' telescopes, rapidly locate planets, deep-sky objects, and bright stars from catalogs

RedShift
Planetarium program

Registax
Freeware tool for alignment, stacking and processing of BMP or AVI image sequences.

SEDS FTP Site
Collection of astronomical software

STSORBIT PLUS
Space Shuttle and Satellite Tracking Software (SOP*.*)

SUNDI
Designed to allow you to quickly and easy design and plan the most popular sundials

Satellite Tracker
Satellite Tracking Software for many types of telescopes including the full line of Celestron, Meade, Astro-Physics, etc

Scope Calculator
Scope Calculator calculates and compares the magnification, field of view, and exit pupil of up to 7 eyepieces when used with a specific telescope

Screen Saver
Earth, moon, and planet screen savers

SimSolar
Solar System Simulator with Moon Phase display & Galilean Moons of Jupiter Simulator

SkyGlobe
Planetarium program

Sky Atlas
A program for anyone that wants to know how to identify constellations and other space objects: stars, galaxies, nebulas, planets

SkyMap
Planetarium software with telescope control features

SkyObserver
Planetarium program for windows

SkyORB VR
A real time visual space simulation with ephemeris

SkyTools
Planetarium program by Skyhound

SkyChart
Planetarium program

Solar Kingdom
A 3D Solar System Simulator and Encyclopedia

Solar Scouts
Course based games designed for grade 6 to early college. Topics include the solar system, space and seasons among others.

Solex
Ephemerides, orbits & planetarium based on numerical integration

Space Weather Applications
Graphs of current space weather data, interactive map of the Sun

Stella Theater
Japanese planetarium currently named Planetarium Pro

Star Atlas Pro
Deep Sky Star Charts and Telescope Control Software

StarLight Pro
StarLight Pro produces animated views of eclipsing binary stars and calculate synthetic lightcurves. The effects of limb darkening, temperature, inclination, stellar size, mass ratio, and star shape are included.

Starry Night
Home of Starry Night and Deep Space Explorer

StellaNavigator
Astronomy Simulation Software

StarChartGL
OpenGL star chart with photo-realistic views of 110,000 stars, 110 messiers and all the planets

StarStrider
A software planetarium, a virtual space-ship, an three dimensional star chart, and more

StarTrak
Software and database to guide a Dobsonian telescope (or any telescope with altazimuth mount)

StarView
Astronomical database browser and research analysis tool

Stellar Magic
Freeware and shareware image processing software. Astronomical image processing tutorial.

StarMessage - Moon Phase and Night Sky screensaver
View the moon phases and write your name in the stars of the night sky

Stellaris
A shareware program for the amateur astronomer

Stellarium
Freeware that renders 3D photo-realistic skies in real time (or here http://www.stellarium.org/)

StarCalc
Professional astronomy planetarium & star mapping program for Windows 9x/ME/NT/2000/XP with plugin support

Sun and Moon Almanac
Graphical Sun and Moon Almanac

Swiss Ephemeris Info
High precision ephemeris

TPoint
Telescope pointing analysis software

TS-24
Crystal Lake Observatory astronomy learning and discovery program.

TachyonNET for PocketPC
A complete astronomical package for serious amateurs. It includes Meade Telescope Control.

Texas A&M Astronomical Software
Lots of Freeware by Don Carona involving the Jupiter system, the Sun, the Moon, etc.

TheSky Pocket Edition
Graphical astronomy program that turns your personal computer into a personal planetarium

The Free Virtual
Galaxy Project a free 3-D virtual space program based upon data obtained from NASA's ADC

TheSky
Planetarium and telescope control program

Trefach Astronomy Centre Software
Network Telescope Control, Blink Comparator and slightly OT GPS Mapper

Tria Image Processing
Allows fast and effective Blind Deconvolution (de-blurring) of any image and opens 16 image types, including 32-bit TiFFs and FITS, and provides 16 additional image processing functions

VITO AstroNavigator
GPS application that displays sky map above you accordingly to your current position, time and direction of movement

Venera 15/16 Radar Mosaic Browser
Windows software allows browsing of the Venera 15 and 16 radar maps.

Virtual Lunar Atlas
Moon image atlas for Windows

Visual Spec
Spectral image analysis software

Where is M13?
Displays the 3-D positions of deep sky objects within and around the Galaxy.

Winstars
Planetarium, showing you the appearance of the sky, as seen from anywhere on Earth, for any date

Xephem
Star-charting, sky-simulating, ephemeris-generating software

Xearth
provides an image of the Earth correctly shaded for the current position of the Sun

Yo Mama
Yale Observatory iMAge Manipulation Application

Macintosh Software

Astronomy Village
Investigating the Universe

AstroPlanner
Astronomical observation planning, logging and telescope control software

AstroImageBrowser
Front end to Digitized Sky Survey (DSS) internet repository of astronomical images

Astro IIDC
Astronomy and Microscopy oriented application developed from the ground up to make FireWire camera imaging easier on the Mac

Best Pair
Software for picking the two best stars for auto alignment with Meade & Celestron scopes

Binary Stars
Free astronomical software for Macintosh computers, complete with manuals, teaching binary star concepts, for classroom or personal use.

CLEA
Macintosh Software Modern Laboratory Exercises in Astronomy

Carina Software
Voyager II, SkyPilot, and SkyGazer

Celestia
A scientifically accurate 3D space simulation (uses OpenGL), contains 3D positions of everything from stars to asteroids and artifical satellites (also a large amount of expansion addons are available)

Digital Universe
Planetarium software

EquinoX
13 different filters for organizing deep sky objects and many controls to adjust the sky display, can run your astro-imaging webcam, has SBIG camera support, and will control your telescope with voice commands

INFO-MAC Science and Math
MoonClock, Moon Tool, NightSky, Planet, StarAtlas, MacAstro, MAIA, etc.

IRAF
Data analysis

Macintosh Scientific Software
Contains scientific software

MacAstronomica
Astronomy/astrology program for the Mac

MoonDock
Shows moon phase on desktop plus other info

RedShift
Planetarium program

SEDS FTP Site - Macintosh
Collection of astronomy software

Scope Calculator (Mac)
Scope Calculator calculates and compares the magnification, field of view, and exit pupil of up to 7 eyepieces when used with a specific telescope

SkyORB VR
A real time visual space simulation with ephemeris

Starry Night
Macintosh planetarium program

Sunlit Earth Widget
Displays the sunlit part of the Earth as will as the city lights from dark side

TheSky
Planetarium and telescope control program

Where is M13?
Displays the 3-D positions of deep sky objects within and around the Galaxy.

Xephem
Star-charting, sky-simulating, ephemeris-generating software

UNIX Software

Clear Sky Institute
Observatory control and astronomical analysis system

ESO-MIDAS
European Southern Observatory Munich Image Data Analysis System VMS, OpenVMS and UNIX systems, including LINUX

fchart
Draws practical, well-readable deepsky finder charts in Postscript (EPS) and Adobe PDF format.

Fireball
Free windows software to calculate atmospheric trajectory and heliocentric orbit of meteoroids.

IRAF
Image Reduction and Analysis Facility

KStars
Planetarium software for the KDE desktop environment

Linux for Astronomy
Includes over 3Gb of Astronomical software precompiled for the Linux (x86) operating system

Nightfall Eclipsing Binary Star Program
Model for eclipsing binary stars, for Linux or any other Unix

Orbit Reconstruction, Simulation and Analysis (ORSA)
A framework for celestial mechanics investigations

QVarStar
QVarStar is a GCVS (General Catalogue of Variable Stars) catalog browser for Unix

Skymap
Planetarium program

Where is M13?
Displays the 3-D positions of deep sky objects within and around the Galaxy.

Xephem
Star-charting, sky-simulating, ephemeris-generating software

Xplns
Displays, calculates, tracks the position of many celestial objects (stars, galaxies, nebulae, constellations, planets, comets, etc.)

Java, JavaScript, and Active Server Pages

3D Solar System
Navigate through the Solar System, approach any planetary body, orbit it, control the flow of time, textured images

Aladin
Sky atlas allowing the user to visualize digitized images of any part of the sky, to superimpose entries from astronomical catalogs or personal user data files, and to access related data and information from the SIMBAD, NED, VizieR, etc.

AstroViewer
The AstroViewer planetarium applet shows a sky map for any time and any location on Earth. Individual printable sky maps (GIF, PDF) can be created.

Astronomy Magazine - Star Dome
Sky mapping program to plan your observing sessions

DeepSkyLive
A free web-based star charting java-applet: draws stars to mag 11.5, can display all NGC objects

Ephemeris.com
Sun to Sedna Ephemeris

Galaxien-Photoscript
Javascript for galaxy observers in German

GeoAstro Applet Collection
Java applets concerning the positions of the Sun and Moon in the sky and much more

J-Track
Java applet that tracks Mir, Hubble, UARS and COBE.

JODAS
Java based Optical Design and Analysis Software

JSkyCalc
Expedites the 'time-and-the-sky' calculations needed by observational astronomers

Java Observing Tool
Earth, moon, sun, planets, and star chart Java tools

Jupiter Events
JavaScript Application

Julian Date
JavaScript Application

Mobile Planetarium for Java Phones
Open-source MIDP1.0/2.0 midlet for Java-enabled mobile/cell phones or handheld device that simulates the whole sky

picoSky
Cellular telephone planetarium

Skynotes
Jupiter's moon positions and Moon Phases

Solar System Live
WWW Interactive

Solar System Simulator
Simulate the sky, planets, and satellites as seen from Earth. Acurate renderings and event predictions (transits, shadows, eclipse, ocultation) of any planet and satellite.

Space Weather Applications
Graphs of current space weather data from NOAA GOES satellites and other data sources

Sunlit Earth Java Desktop Application
Displays the sunlit part of the Earth as will as the city lights from dark side

Sun And Moon Times
Mobile phone software to calculate the rise and set times for the Sun and Moon and the Moon phase.

Sun and Moon Almanac
Interactive almanac

The Planets
Java Application to plot Jupiter's Moons and Saturn's Rings

Where is M13?
Displays the 3-D positions of deep sky objects within and around the Galaxy.

Your Sky
Interactive web-based planetarium

Astronomy Code

Amazon.com Astronomy Books
Astronomy With Your Personal Computer by Peter Duffett-Smith, Astronomical Formulae for Calculators by Jean H. Meeus, Astronomical Algorithms by Jean Meeus, Textbook on Spherical Astronomy by W. M. Smart, Robin Michael Green, Mathematical Astronomy Morsels by Jean Meeus, Fundamental Ephemeris Computations by Paul J. Heafner, Explanatory Supplement to the Astronomical Almanac by P. Kenneth Seidelmann

Approximate Astronomical Positions
Some code and explainations by Keith Burnett

Duffett-Schmitt: Astronomy With Your PC
Astronomy BASIC code, ICE, and other code

FAQ: Astronomy Calculations for the Amateur
Code examples

The Sky Online Astronomy Software
Lots of BASIC Code, search for the article 'Basically Speaking' as well

Willmann-Bell, Inc.
Publishers of of astronomy books on photometry, CCD's, and catalogs

Online Data Sources

Astronomical Data Center - Goddard
Data resource

Star, Asteroid and NGC Catalogs
Star, Asteroid and NGC Catalogs

Telescopic Companion Books
Data resource

The Space FAQ
The Space FAQ

Other Astronomy Software

AIPS
Astronomical Image Processing System

Astronomy Software (in french and english)
Astronomy Software

AstroWeb - Astronomy Software Servers
Astronomy Software

AstroTips.com
All about Astronomy Software

David Eagle's Celestial and Orbital Mechanics Web
Links to MATLAB files and PC programs

SEDS FTP Site
SEDS FTP Site

STSci Free Space Science Software
Astronomy Software

Software for Eclipsing Binary Stars
Astronomy Software

TachyonNET for PocketPC
A complete astronomical package for serious amateurs. It includes Meade Telescope Control among dozens of other functions.

Yahoo! Astronomy Software
Astronomy Software

What's New
These latest additions also appear above.

3D Space Tour screensavers
Animated 3D screensavers with cosmic scenes. Photo-realistic and scientifically correct graphics.

Lunar Phase Pro
Moon observer's toolkit. Contains lunar phenomena predition tools, interactive moon atlas, searchable database of over 9,000 features and many other tools.

RSI New Moon
Easy-to-use educational software for middle school through college. 3D views of the Moon's phases, the Solar System, and more.

Visual Spec
Spectral image analysis software

Celestia
A free real-time space simulation that lets you experience our universe in three dimensions

JSkyCalc
Expedites the 'time-and-the-sky' calculations needed by observational astronomers

AstroGemini Screen Savers
Astronomy screen savers

Astronomical Observation Log
Log down your observations and import a pic or sketch of the object your observing.

Astro IIDC
Astronomy and Microscopy oriented application developed from the ground up to make FireWire camera imaging easier on the Mac

AstroCalc
Calculates the position of planets and give their appearance

Meteor Observation Log
Log is designed around a 3 hour observation session with the capablity to record up to 20 meteors an hour

Moon Map for Pocket PC
A vectorized moon map for the Pocket PC and Palm devices.

StarCalc
Professional astronomy planetarium & star mapping program for Windows 9x/ME/NT/2000/XP with plugin support

Sky Atlas
A program for anyone that wants to know how to identify constellations and other space objects: stars, galaxies, nebulas, planets

Delphinus
Freeware designed to control Canon DSLR Cameras by Serial Port (RS-232)

FlashSkies
Online Flash Planetarium for every Browser

Mobile Planetarium for Java Phones
Open-source MIDP1.0/2.0 midlet for Java-enabled mobile/cell phones or handheld device that simulates the whole sky

Stellar Magic
Freeware and shareware image processing software. Astronomical image processing tutorial.

StellaNavigator
Astronomy Simulation Software

DeskMoony
Calculates current moon phase and draws it nicely.