Graphics

• Blender - 3D modelling, animation and rendering software includes python (Windows, MacOSX, Linux) http://www.blender.org (Free)
  Blender-manual - see Blender home site for latest version (platform independent) http://wiki.blender.org/index.php/Manual (Free)
• Dia - free vector drawing software - requires GTK+ which is included in Gimp (Windows, MacOSX, Linux) http://dia-installer.sourceforge.net (GPL)
  Dia-manual - see Dia home page for latest version (platform independent) http://dia-installer.t (GPL)
• Gimp - GIMP Graphics image editor - includes GTK+ (Windows, MacOSX, Linux) http://www.gimp.org/ (GPL)
  Gimp-manual - see Gimp home page for latest version
  
• Inkscape - Popular Vector Drawing package (Windows, MacOSX, Linux) http://sourceforge.net/projects/inkscape/ (GPL)
• k3dsurf - 3D surface generator to visualize and manipulate Mathematical models in 3, 4, 5 & 6 dimensions (Windows, MacOSX, Linux) http://k3dsurf.sourceforge.net (GPL)
• LeoCAD - 3D CAD program using toy bricks with more than 1000 different pieces (Windows, Linux) http://leocad.org (Free)
• Povwin - POV-Ray Persistence of Vision Ray Tracer (Windows, MacOSX, Linux) http://www.povray.org (Free for Personal Use, POVray End-User License)
• BRL-CAD - cross platform constructive solid geometry and modelling system (Windows, MacOSX, Linux) http://sourceforge.net/projects/brlcad/ (LGPL)
• CGAL - Computational Geometry Algorithms Library (Windows, MacOSX, Linux) http://www.cgal.org/ (GNU Lesser General Public License and Q Public License)
• Jahshaka - hardware accelerated editing and effects system for 3D pictures with music (Windows, MacOSX, Linux) http://www.jahshaka.org/ (GPL)
• MayaVi - Data Visualizer (Windows, Linux) http://mayavi.sourceforge.net (Free)
• gCAD3D - includes plotutil, tausc, translucency, varkon_sources (Linux) http://www.cadcam.co.at/freiter/gCAD3D_en.htm (GPL)

Computer Games

Action Games

• Battle Tanks - funny battle with cartoon-like graphics and cool music (Windows, MacOSX, Linux) http://btanks.sourceforge.net/ (Free)
• LBreakout2 - Aim a ball at bricks until all bricks are destroyed (Windows, MacOSX, Linux) http://lgames.sourceforge.net/index.php?project=LBreakout2 (GPL)
• Pingus - Free Lemmings like game with 22 levels (Windows, MacOSX, Linux) http://pingus.seul.org/ (GPL)
• SMC - Secret Maryo Chronicles - open source 2D platform game similar to classic sidescroller games (Windows, MacOSX, Linux) http://www.secretmaryo.org/ (GPL)
• Torcs - The Open Racing Car Simulator (Windows, MacOSX, Linux) http://sourceforge.net/projects/torcs/ (GPL)
• Tuxracer - Penguin down hill racer game (Windows, MacOSX, Linux) http://tuxracer.sourceforge.net/ (GPL)
• XMoto - challenging 2D motocross platform game (Windows, MacOSX, Linux) http://xmoto.tuxfamily.org (GPL)
• Ultimate Stunts - spectacular stunts, like loopings, corkscrews, bridges to jump over, etc., but the best thing is that you can design your own tracks! (Windows, MacOSX, Linux) http://ultimatestunts.nl/index.php? (GPL)



Tactics Games

• Battle for Wesnoth - Turn based strategy game with a fantasy theme (Windows, MacOSX, Linux) http://www.wesnoth.org/ (Free)
• FooBillard - Free OpenGL 3D billard game (Windows, Linux) http://foobillard.sunsite.dk/ (GPL)
• LMarbles - Atomix clone using shapes instead of molecules to solve puzzles (Windows, Linux) http://lgames.sourceforge.net/index.php?project=LMarbles (GPL)
• Scorched3D - Tacticle Tank style 3D game (Windows, MacOSX, Linux) http://www.scorched3d.co.uk (Free)
• VegaStrike - Open Source 3D Action-Space-Sim that lets you trade, fight and explore in a vast universe (Windows, MacOSX, Linux) http://vegastrike.sourceforge.net/ (Free)



Simulation Games

• Aiplanet - Artificial Planet game (Windows, MacOSX, Linux) http://aiplanet.sourceforge.net/ (GPL)
• C-evo - Civilisation evolution empire building strategy game (Windows) http://www.c-evo.org/ (Free, Public Domain)
• Fgsetup - Flight Gear - Learn to fly using Flight Simulator (Windows, MacOSX, Linux) http://www.flightgear.org/ (GPL)
• Freeciv - empire-building strategy game inspired by the history of human civilization (Windows, MacOSX, Linux) http://freeciv.wikia.com (GPL)
• Lincity - City Simulation game (Windows, MacOSX, Linux) http://lincity-ng.berlios.de/wiki/index.php/Main_Page (GPL)



Board Games

• GNUchess - Chess on Windows requires Winboard (Windows, MacOSX, Linux) http://www.tim-mann.org/gnuchess.html (GPL) http://www.gnu.org/software/chess/
• Winboard - Chess board for windows http://www.tim-mann.org/winboard.html (GPL)
• Orthello3d - Orthello board game in 3D (Windows) http://orthello3d.sourceforge.net/ (Free)
• PyScrabble - online multiplayer scrabble game (Windows, Linux) http://pyscrabble.sourceforge.net/ (Free)
• Sudoku Sensei - generates new Sudokus (Windows, Linux) http://sudoku-sensei.sourceforge.net (GPL)



More Games

• Alex the Allegator - Series of games featuring everything from puzzle games to racing and platform jump n runs (Windows, MacOSX, Linux) http://sourceforge.net/projects/allegator/ (GPL)
• FretsonFire - Play along with scrolling on-screen musical notes to complete a song (Windows, MacOSX, Linux) http://fretsonfire.sourceforge.net/ (GPL)
• pydance - dancing simulator written in python - highly configurable, colourful arrow motion, limitless dance steps, dance pad support (Windows, MacOSX, Linux) http://icculus.org/pyddr/ (MIT License)
• StepMania - Free dance and rhythm game with 3D graphics, dance pad support and step editor (Windows, MacOSX, Linux) http://www.stepmania.com/ (MIT License)
• Ultrastar Deluxe - Music karaoke machine to sing along with on-screen music (Windows, MacOSX, Linux) http://www.ultrastardeluxe.org/ (GPL)
• Superuser Learning Centre - Games that empower http://superuser.com.au/wiki/index.php/Games_that_empower
• FSF/UNESCO Free Software Directory - games http://directory.fsf.org/games/
• Open Source Games for Windows http://osswin.sourceforge.net/games.html
• Wikipedia - List of open source games http://en.wikipedia.org/wiki/List_of_open_source_games

Game Engines

2D Engines

• Pivot - Pivot Stickfigure Animator to build stick figures http://www.geocities.com/peter_bone_uk/pivot.html (Free)
• GameDev - The scrolling game development kit for 2D game development (Windows) http://gamedev.sourceforge.net/ (Free)
• SpriteCraft - Freeware 2D game engine (Windows) http://www.suda-chen.biz/?page_id=9 (Free)
• Total Eclipse - 2D Games Engine which uses a simple point and click system - requires TE-libraryfiles (Windows) http://www.freemmorpgmaker.com/ (Free)



3D Engines

• Alice - Educational software that teaches students computer programming in a 3D environment (Windows, MacOSX, Linux) http://www.alice.org/ (Alice End User License Agreement)
• CELstart - Crystal Space 3D free cross-platform software development kit for realtime 3D graphics (Windows) http://www.crystalspace3d.org/ (GPL)
• Delta3D - 3D Games Engine for a wide variety of modeling & simulations designed for first person shoter games (Windows) http://www.delta3d.org/ (LGPL)
• Horde3d - Small 3D rendering engine (Windows) http://www.nextgen-engine.net/ (LGPL)
• IrrLicht - Game Engine which uses OpenGL (Windows, Linux) http://irrlicht.sourceforge.net/ (Free)
• Lilth3D - a simple 3D engine for outdoor games (Windows) http://sourceforge.net/projects/lilith3d/ (Free)
• NeoEngine - Open source 3D game engine, multiplatform, OpenGL and DirectX (Windows, Linux and MacOSX) http://www.realityrift.com/technology/neoengine/ (GPL)
• Ogre3D - 3D graphics rendering engine SDK designed to help create greate games (Windows, MacOSX) http://www.ogre3d.org/ (LGPL)
• OpenFx - 3D modeling, animation and rendering suite (Windows) http://openfx.org/ (GPL)
• OpenSceneGraph - OSG is designed to create scenary and requires openGL (Windows, Linux) http://www.openscenegraph,com/ (GPL)
• OpenGL - open source graphics library (Windows, MacOSX, Linux) http://www.opengl.org/ (SGI OpenGL Licensing Programs)
• VBsetup - Visual Basic 2005 Microsoft Express Edition (Windows) http://msdn2.microsoft.com/en-us/express/aa718406.aspx (Free)
• VTP - Virtual Terrain Project - tools for constructing the real world in interactive 3D (Linux) http://www.vterrain.org (Free)
• Wikipedia - List of games engines http://en.wikipedia.org/wiki/List_of_game_engines