Open Source Solid Modeling CAD
BRL-CAD is a powerful cross-platform constructive solid geometry solid modeling system that includes an interactive geometry editor, ray-tracing for rendering & geometric analyses, network distributed framebuffer support, image & signal-processing tools.
Smokin' Guns is a GPLv2 licensed first person Western style shooter based on the Quake 3 engine (Id Tech 3) developed by a loosely knit team of developers and artists. This project represents the game engine.
Cross-platform port of Arx Fatalis, a first-person role-playing game
Arx Libertatis is a cross-platform, open source port of Arx Fatalis, a 2002 first-person role-playing game developed by Arkane Studios. Arx Fatalis features crafting, melee and ranged combat, as well as a unique casting system where the player draws runes in real time to effect the desired spell. The Arx Libertatis source code is based on the publicly released Arx Fatalis sources and available under the GPL 3+ license. This does however not include the game data, so you need to obtain a copy of the original Arx Fatalis or it's demo to play Arx Libertatis.
Abysmal is a project that aims to recreate an engine for System Shock 1 and Ultima Underworld that can run those games with the original data files.
Discrete-event simulation library.
This project's goal is to develop and maintain a high-quality, 3D, physics-enabled, discrete-event simulation library that can be used for industrial simulation projects in an engineering and/or manufacturing environment.