What is the programming language that was used to make openarena? Cobol, C, B?
The engine was coded in (almost) ANSI C by Id Software. Openarena uses the GPLed version called ioquake3. It can be compiled under different OSes (Win32 , Linux, NetBSD, Mac, etc.). However, the engine is only a small part of Openarena. Most of the new stuff is not software but artwork (textures, MD3 models, maps, etc.).