One of the most advanced Doom/Heretic/Hexen/Strife source port around has released a new version (some time ago, admittedly), bringing it to version 1.25. In addition to fancy-pants OpenGL rendering, models, 3d floors, slopes, and lots else, Mr. Legzdinsh's port now boasts the following improvements:
It has a new inventory system, several new features and changes to the VavoomC language and progs structure, rewritten graphical launcher which is now also available on Linux and other platforms, and of course other improvements and bug fixes.
Sounds interesting! Why not wander over to their website and have a little look-see?