Shisen-Sho Mahjongg-like Tile Game

Challenging pentomino puzzle

A game like Monopoly

Engaging math game for children

Chess with Fog-of-War and shuffled officers

A real-time build-up strategy game

A point & click adventure game

A modern Linux port of the "metroidvania" game Hydra Castle Labyrinth

A relaxing match 3 puzzle game with a twist

A great 2D soccer (sometimes called football) game

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

First-person shooter with agile gameplay and built-in editor

An alien lands in a kindergarten where the children quickly turn hostile

Save your friends from the ghosts!

Falling platforms game

A free/libre collection of fast-paced mini-games

Cosmic horror first-person shooter

A terminal based Pokemon like game

Fun with Blocks

A modernization effort of DOOM-3-BFG

Turn-based strategy game

Cross-platform engine for the Ultima VII games

Physics sandbox game

Obtain the 2048 tile

Breathtaking 3D space game in the rings of Jupiter

A simple combat tracker app for ttrpg games

Dhewm 3 is a Doom 3 GPL source port

Open source Stronghold fan remake

Classic overhead run-and-gun game

Remake of the game Dynablaster