Vavoom is Doom/Heretic/Hexen/Strife source port. It features software, OpenGL and Direct3D rendering, VavoomC scripting language, slopes, 3D-floors, Quake style lighting engine, pure client/server architecture with in-game joining and a lots more.
Sadly, development stopped years ago, but in some ways still the best Doom engine source port out there. Also, pretty good for custom mod development, offering a C like programming language to write code in that can be seamlessly added to the existing engine.
Very useful project!
thanks man, great soft!