OpenArena is a 3d game creation engine. It is a rendering system that can be used for more than just games but it is targeted at games. The basic use being create some game media textures models maps and config files for physics and rules.
OpenArena aims to be a free, yet compatible clone of Quake III Arena. It also strives to add subtle enhancements such as new gametypes, playermodels and of course maps!
Further improvements are incorporated by using the ioquake3 engine.
Tremgcc is a standalone compiler suite especially created to build tremulous videogame, but is able to compile ioquake/openarena, gnupg and other small programs too.
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OpenArena mod with the intention to fork it. The aim of AfterShock is to produce an open source alternative for Quake 3 / Quake Live.
Source: http://code.google.com/p/oaunofficial/