3D Lightcycle Game

Dhewm 3 is a Doom 3 GPL source port

Solve puzzles in style

Open source first person shooter

Brogue: Community Edition - a community-lead fork of the much-loved minimalist roguelike game

Explore great pyramid

Free and open-source Quake 3 based engine

A modern Dune II reimplementation

A balanced, easy to use, and powerful modern Minecraft launcher

Epic hand-game duels

Physics-based Tetris

Zelda3 is a reverse engineered clone of Zelda - A Link to the Past

Cross-platform Celeste Mod Manager

3D Fishing Game

2D action/rpg space trading combat game

A sweet Chess game

2D motocross platform game

Dominate the board in a classic reversi game, or play the reversed variant

Futsal team-management game.

Modern cross-platform port of the Descent engine

Hack your way through this side-scrolling action adventure shooting game

Explore, trade, and fight in a 2D galaxy.

KDiamond is a three-in-a-row game by KDE

Bullet hell shoot 'em up game set in the Tōhō universe

Old cellphone arcade recreation

EDuke32 is an awesome, free homebrew game engine

Viper is a launcher and updater for Northstar, and not much more than that

A remake of the platform game

Hack your way to saving the day

Airshipper is the official launcher for Veloren.