FlightGear Flight Simulator: free open-source multiplatform flight sim
Founded in 1997, FlightGear is developed by a worldwide group of volunteers, brought together by a shared ambition to create the most realistic flight simulator possible that is free to use, modify and distribute. FlightGear is used all over the world by desktop flight simulator enthusiasts, for research in universities and for interactive exhibits in museums. FlightGear features more than 400 aircraft, a worldwide scenery database, a multi-player environment, detailed sky modelling, a flexible and open aircraft modelling system, varied networking options, multiple display support, a powerful scripting language and an open architecture. Best of all, being open-source, the simulator is owned by the community and everyone is encouraged to contribute.
A planetarium software that shows a 3D simulation of the night sky
Stellarium renders 3D photo-realistic skies in real time with OpenGL. It displays stars, constellations, planets, nebulae and others things like ground, landscape, atmosphere, etc.
A free transportation simulator game
Simutrans is a cross-platform simulation game where players try to successfully manage transportation systems between places by land, air, and water for passengers, mail, and goods. Planes, ships, trains, trams, trucks, buses, or monorails are at your disposal, but factories operate based on contracts and passengers can only travel to their set destinations.
DivFix++ is yours AVI video repair and preview software. It designed for repair and preview files which are on download from ed2k(emule), torrent, gnutella, ftp. web or any other source on the internet. It can repair AVI and DivX files (for now.)
VASSAL is a game engine for creating electronic versions of traditional board and card games. It provides support for game piece rendering and interaction, and supports play by email or over a live connection.
3D space trading and combat game
Oolite is a free and open source space trading and combat simulation game where you are the pilot of a spacecraft capable of interstellar travel. Inspired by the classic 8-bit game Elite, it features many similar aspects of gameplay. You can travel to different planetary systems, encounter challenges and embark on missions in a quest for wealth and glory. Oolite runs on Mac OS X (10.6 or later), Windows (XP or later), and Linux, and does not require the latest hardware except for certain expansion packs. Powered by Objective-C and OpenGL, it is designed as a small game that users can easily pick up, modify and expand.
SmartPropoPlus - Turning your R/C transmitter into a Flight Simulator Joystick
SimPE is a Tool for editing nearly all aspects of Sims 2, starting from simple Character changes (Skills, Names,Relationships...) up to the creation of new Objects and Color Options, containing Wrappers and Editor for nearly all Sims 2 Filetypes.
A 3D simulator game where you can drive, fly, and sail
Rigs of Rods is a 3D simulator game where you can drive, fly and sail various vehicles using an accurate and unique soft-body physics engine. Since 2014, the development continued at https://github.com/RigsOfRods/rigs-of-rods UPDATE: 10/30/2016: removed opencandy installers, replaced with zip files.
A tool to edit profile and saved game files for FasterThanLight.
A 3rd-party tool to edit user files for the game FasterThanLight. With this, you can unlock any or all ships and achievements in your user profile, or tweak most aspects of saved games: crew, systems, weapons, fires, breaches, etc.
A free, industrial quality library for simulating articulated rigid body dynamics - for example ground vehicles, legged creatures, and moving objects in VR environments. It's fast, flexible & robust. Built-in collision detection.
StepMania is a music/rhythm game. The player presses different buttons in time to the music and to note patterns that scroll across the screen. Features 3D graphics, visualizations, support for gamepads/dance pads, a step recording mode, and more! WE HAVE MOVED TO GITHUB.
"Roberge's Used Robot (RUR) : a Python Learning Environment" is a Python implementation of a "robot environment" as introduced by R. Pattis in 1981. RUR is similar in spirit to GvR, although it uses Python syntax. SEE http://code.google.com/p/rur-pl
Pioneer is a space adventure game set in the Milky Way galaxy at the turn of the 31st century.
Speed Dreams is a Motorsport Simulator featuring high-quality 3D graphics and an accurate physics engine, all targeting maximum realism. Initially forked from TORCS, it has now reached a clearly higher realism level in visual and physics simulation, thanks to its active development team and growing community. It mainly aims to implement exciting new features, cars, tracks and AI opponents to make a more enjoyable game for the player, while constantly pushing forward visual and physics realism. It is also intended for any research, study or teaching activity, around physics and AI, thanks to its GPL V2+ license, and the clear and modular architecture of its C/C++ code base.
Ur-Quan Masters High Definition
Ur-Quan Masters HD Mod. An HD remake of Star Control 2. It's the full Ur-Quan Masters game but also featuring a high resolution mode, new features, & new artwork.
Classic America's Army
A GUI client application for Downloading Installing and Playing Americas Army 2.5 on Windows, Mac and Linux with a new custom authorization system. On the server side a Desktop server manager for Windows, Mac and Linux and a Command line dedicated server manager for Windows and Linux. Backend server components include a replacement authorization system using the Battletracker account & stats database and a PunkBuster log streaming server which records players possible cheating activities.
Another version of the simple action game modeled after the lightcycle sequence of the movie Tron.
Stunt Rally game with Track Editor, based on VDrift and OGRE.
ONLY for Releases. Visit homepage on http://stuntrally.tuxfamily.org/
Tools using the s3pi library and other related works
sims3tools provides a set of tools for the Sims3 modder, based around the s3pi library. It includes: a package editor (s3pe), which allows most useful resources to be edited; an Object / CAS Part cloner (s3oc) for creating a base for modifications; a sims3pack packer/unpacker (s3su), which simplifies handling the content of these files; a string table editor (s3se) for allowing string table resources to be efficiently edited; plus a number of additional utilities. Note that development on sims3tools has now finished.
A free racing simulator with excellent physics and graphics.
Remake of the classic Caesar III game
CaesarIA is an open source remake of Caesar III game released by Impressions Games in 1998, it aims to expand the possibilities of the classical city-building simulators and to add new features showing the city life. Now the game work with Windows, Linux, Mac, Haiku and Android. The original Caesar3 game is needed to play openCaesar3. We start crowdfunding campaign for renew graphic set at www.igg.me/at/caesaria-game. Help us set new stage in good old Caesar.
LinCity-NG is a city simulation game. In the game, you are required to build and maintain a city. You can win the game either by building a sustainable economy or by evacuating all citizens with spaceships.
Visual Pinball - Original by Randy Davis. Source released under a MAME-like license (no commercial use) in February 2010. http://vpinball.svn.sourceforge.net/viewvc/vpinball/trunk/license.txt?revision=194
Project Apollo - NASSP (also known as NASSP or NCPP) is an add-on for the Orbiter space flight simulator. Project Apollo simulates the Apollo missions to Earth orbit and the Moon and the planned post-Apollo missions that never flew.