Internet Links to Public Domain, Freeware, and Shareware Astronomy Programs
Directories of Software
- Sky & Telescope's BASIC Program Listings
- Hugo D. Valentim's Astro Tips
- Searchable shareware library
- Astronomy Programs at SpaceBox
- Astronomy Software on the Internet
- Bill Arnett's Astronomy Software Listing
- Dan Bruton's Astronomy Software Listing
- Freeware Astronomy Downloads
Planetarium, Sky Charting, and Space Simulation
- Cartes du Ciel by Patrick Chevalley (Win)
- Celestia by Chris Laurel (MacOS)
- Coeli Software's Visual Planets, New Windows Dictionary of Astronomy, and others (Win)
- C88 by Alcyone Software (Win)
- CoolSky by Piotr Czerski (Win)
- CyberSky by Stephen Schimpf (Win)
- Distant Suns by Mike Smithwick (Win)
- EquinoX by Microprojects (MacOS)
- HNSky by Han Kleijn (Win)
- Home Planet by John Walker (Win)
- JupSat95 by Gary Nugent (Win)
- Kagayaki IV by SeedsBox (Win)
- MacAstronomica by Artistic Techworks (MacOS)
- MyStars! by David Patte (Win)
- Night Sky by Kaweah Concepts (MacOS)
- Night Vision by Brian Simpson (OS/2)
- Planet's Orbits by Alcyone Software (Win)
- Power Age Sky Simulator by George Dragandjikov (Win)
- Stargazer's Delight by Kaweah Concepts (MacOS)
- StarStrider by FMJ-Software (Win)
- sofTouch APpLications's MOONCLOCK, ASTROCAL, and others (MacOS)
- Spica by Richard Guillaume (Win)
- Stellarium by Fabien Chéreau (Win/MacOS/Linux)
Lunar Observing
- LunarPhase by Gary Nugent (Win)
- Lunar Calculator and Clementine Skimmer by Alister Ling (Win)
- Virtual Moon Atlas by Patrick Chevalley and Christian Legrand (Win)
- MoonCalc by Monzur Ahmed (Win)
- MoonMenu by Selznick Scientific Software (Win/MacOS)
Other Observing Utilities
- Astronomer's Digital Clock by Matt Oltersdorf (Win)
- AstroPlanner by iLanga, Inc. (Win/MacOS)
- DarkAdapted by Stephen Hutson (Win/MacOS)
- David Paul Green's Free Astronomy Software: The Simple Observing Log, The Eyepiece Calculator, and others (MacOS)
- Lunar Occultation Workbench by Dutch Occultation Association (Win)
- MAXCLOCK by Udo Mark (Win)
- Skygazer Ephemeris, StarLog, and TeleCalc by John Biondo (Win)
- Varobs by Patrick Chevalley (Win)
Optics and Equipment
- Aberrator and Registax by Cor Berrevoets (Win)
- Basic Newtonian Telescope Calculator by Dave Richardson (DOS)
- Image Stacker and AstroImager by Keith Wiley (MacOS)
- Modern Optical Design and Analysis Software by Ivan Krastev (Win)
Hand-held computers
- AstroMist by Cyrille Thieullet (Palm)
- AstroPhoto and MessierLog by John Biondo (Palm)
- Lunar, Orrery, and Jovian by Astro-Metrics (Palm)
- Planetarium by AHo (Palm)
- Planisphere by Check-Tech Software (Palm)
- PleiadAtlas by Brian Tung (Palm)
- Pocket Stars by Nomad Electronics (Pocket PC)
UNIX/Linux/X11
- European Southern Observatory's Scisoft compilations
- Image Reduction and Analysis Facility (IRAF)
- ESO-MIDAS
- FTOOLS
- Hitchhiker by Aaron Worley
- Light Speed by Daniel Richard G.
- Nightfall by Rainer Wichmann
- SAOimage
- Xephem by Elwood Downey
Physics and Astrophysics
- AstroGrav by AstroGrav Astronomy Software (Win/MacOS)
- Cavendish by Benjamin Blonder (MacOS)
- G-Lens by Mark Boughen (Win)
- Gravitation 3D by Roice Nelson (Win)
- Newton's Aquarium by Living Graphs(Win/MacOS)
- Orbit Xplorer by OttiSoft (Win)
Other
- Astro Utilities Electronic Book for Mathcad
- Halo3 by Les Cowley and Michael Schroeder (Win)
- PCs in Space by Jackson and Tulls (Win)
- PlanetWatch by Galen Raben (Win)
- Shadows by François Blateyron (Win)
- Solscape by StimpSoft (MacOS)
- Space Telescope Science Institute's Electronic PictureBooks (Win/MacOS)
- TRAKSAT and WinTrak by Paul Traufler (Win)
- Urania for Hewlett-Packard pocket calculators by Georg Zotti
