Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
Developers working on the Unvanquished open-source game as a visually impressive project have been advancing their OpenGL 3.x renderer.
Unvanquished is based upon the open-source id Tech 3 engine with the XReaL rendering improvements to form what they call the OpenWolf engine. There's a GL3 renderer with this work and they have been working to improve it as of late.