Syntensity, also known as the Syntensity Engine, and previously also called the Intensity Engine, is an open source project that consists of a client, server, and master (metadata) server – everything you need to run your own games or your own virtual world.
Emscripten is an LLVM to JavaScript compiler. It takes LLVM bitcode (which can be generated from C/C++ using Clang, or any other language that can be converted into LLVM bitcode) and compiles that into JavaScript, which can be run on the web (or anywhere else JavaScript can run).
Ri-li is an arcade game licensed under the GPL (General Public License). You drive a toy wood engine in many levels and you must collect all the coaches to win. You can play on Linux, Mac OsX, Windows and AmigaOS4.
Black Mesa is a FREE and complete re-creation of the game Half-Life, utilizing the Source engine. Black Mesa will let you re-visit the world that started the Half-Life continuum.
Black Mesa will require the Source SDK Base 2007 to run. Many Source games purchasable through Steam come with the Shared Resources, including the SDK, that you will need in order to run Black Mesa. To see if you can run Black Mesa, open Steam and look in the tools tab. If you see an entry titled Source SDK Base 2007, you can run Black Mesa. As of July, 2011, Valve made the Source SDK free for anyone to download. This means that users who create new Steam accounts will be able to play Black Mesa without having to purchase any games.
Do you remeber Nexuiz? The first version of the game was released in 2005. Development continued with many online contributors over the years, with version 2.5 released in October of 2009. In mid-2010 it was announced that a new XBLA, PSN, and Steam downloadable remake of Nexuiz would be done from the ground up by IllFonic using Crytek’s highly anticipated CryENGINE3 game engine.
You can play the Nexuiz on Steam for free this weekend.
FlightGear is an open-source flight simulator. It supports a variety of popular platforms (Windows, Mac, Linux, etc.) and is developed by skilled volunteers from around the world. Source code for the entire project is available and licensed under the GNU General Public License.
