BillardGL
BillardGL – free and open source 3D pool game for one or two players
Veloren
Veloren is a free and open source, multi-platform multiplayer voxel RPG inspired by games such as Cube World, Legend of Zelda: Breath of the Wild, Dwarf Fortress, and Minecraft
X-Moto
X-Moto is a free and open source multiplatform 2D motocross platformer game, a 2D motorcycle trial simulator
Not Tetris 2
Not Tetris 2 – free and open source, multiplatform classic Tetris, but with realistic physics
Wolfenstein: Blade of Agony
Wolfenstein: Blade of Agony is a free-to-play first-person shooter similar to Wolfenstein 3D, Medal of Honor, and Call of Duty, but with a more dynamic game in the spirit of Doom
Lunar Lander
Lunar Lander is a free and open source simple arcade game in the style of a lunar lander
KFourInLine
KFourInLine is a free and open source board game for two players in which players try to line up a row of four pieces
Infector
Infector is a free and open source version of the classic board games Ataxx and Hexxagon
OpenPref
OpenPref – free and open source preference card game for Linux