Risk like turn-based strategy game

Doom BFA is a Doom 3 BFG GPL source port

3D Fishing Game

Kitty that follows your mouse pointer toy on desktop

Block sliding puzzle game

A 2D MMORPG client

Rebuild an unraveling world

The head-to-head multiplayer volley-ball game

A 3D space mining game

Open source first person shooter

A turn based tactical war game

Find your path in a maze of numbers

A crayon-drawing based physics puzzle game

EDuke32 is an awesome, free homebrew game engine

Play online RTS games with the Spring engine

Python fitting assistant for EVE: Online

Classic instrument based rhythm game

A chess database application

FPS aim trainer

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

A pixel art 2d platformer game.

Classic biplane shoot-'em up

Open source chess GUI for chess engines

Play Zenless Zone Zero on Linux

Like a StackMat but for Linux

Online multiplayer shooter game

An addictive game about frozen bubbles

A kart racing mod based on the 3D Sonic the Hedgehog fangame Sonic Robo Blast 2

Third person ninja rabbit fighting game

ChessMD is a Qt-based chess app to play, analysis, review chess game and browse chess opening database.