reQuiem is a custom OpenGL Quake engine for Windows and Linux.
It is based on JoeQuake and was developed by jdhack. Read more.
It happens to run Nehahra reasonably well, so that's this fork's main focus: filing off some remaining rough edges. Feel free to submit bugs if you find any, but extra features (BSP2, CSQC, physics independence, etc) are beyond the scope here.