Arcade

Chromium B.S.U. is a free and open source, space-scrolling shooter in an arcade style

Dungeon Crawl Stone Soup is a free and open source game in the Roguelike genre, an adventure through dungeons filled with dangerous monsters in search of the mysteriously fabulous Orb of Zot

Scorched3D is a free and open source, multi-platform simple turn-based artillery strategy game in real time

Atomic Tanks is a free and open source, multi-platform turn-based artillery strategy game, a clone of Scorched Earth

IceBreaker is a free and open source, multi-platform game based on the Xonix game

BrickBuster is a free and open source, multi-platform Brick Breaker game whose goal is to survive as many rounds as possible

Sonic Robo Blast 2 is a free and open source, multi platform 3D fan game of Sonic the Hedgehog, based on a modified version of Doom Legacy

Sonic Robo Blast 2 Kart is a free and open source, multi-platform kart racing game based on 3D Sonic and Sonic Robo Blast 2

Not Tetris 2 – free and open source, multiplatform classic Tetris, but with realistic physics

HexGL is a free and open source futuristic racing game for Linux