Looks like we will get some nice x-mas presents this year:
A bit delayed but probably right on time for the Mayan end of the world, we will see a long awaited new release of Cube2:Sauerbraten. Read about the release announcement here. Hmm, I wonder if it has already Occulus Rift support...
Also on the FPS front, AlienArena is having a major engine update, with a claimed massive 3-4 times speed increase in BSP rendering and more VBO improvements.
|Mars meets CounterStrike?|
Last but not least, GarageGames has announced that after the recent FOSS licensed release of their 3D engine Torque3D (see latest updates here, sadly no working Linux port yet), they will also open-source their 2D engine!
Also no Linux port yet, but just as for the 3D engine one will hopefully show up sooner or later.
P.S.: In case someone has missed it: SuperTuxKart had a very nice new release recently, bumping it up to version 0.8. See a video of it in action here.