A Phoronix reader has been writing in lately about Berserker@Quake2: a game mod that modernizes some elements of the Quake 2 graphical system. This Berserker mod supports real-time per-pixel lighting and shadow volumes, parallax, mirrors, fog, decal system, high resolution textures, and more... Nothing exciting when compared to today's modern games, but breaths some new life into Quake II that was first released back in 1997.
Berserker@Quake2 has been around since about 2005, but only supported on Windows. Now though the Russian developer behind this game mod has finally published his code in hopes of someone porting it to Linux.
If you are interested in checking out the code for this souped-up version of Quake 2 and/or want to lend a hand in porting it to Linux, the code was just published to SourceForge.net.