WikiBattle - 1v1 race who first reaches a randomly selected article.
Wiki Game - Explore & race through wikipedia.
Hordes - Free to play 3D Multiplayer Browsergame in Open Beta.
OneLife - Multiplayer survival game of parenting and civilization building.
OpenMW - Open-source open-world RPG game engine that supports playing Morrowind.
OpenDiablo2 - Open source re-implementation of Diablo 2.
Pioneer - Game of lonely space adventure.
openage - Free (as in freedom) open source clone of the Age of Empires II engine.
AIDungeon2 - Infinite adventures await.
Julius - Open source re-implementation of Caesar III.
Vinifera - Open source re-implementation of Tiberian Sun : Firestorm written in C++.
Chronoshift - Open Source Re-Implementation of Command and Conquer: Red Alert.
FreeAge - Open-source reimplementation of the game engine of Age of Empires 2: Definitive Edition.
Good Web Game - Minimal 2d game framework for wasm.
Paddlers - Multi-player real-time strategy browser game.
LSD - Line-square-dot: an addicting game.
OpenDUNE - Open source re-creation of the popular game "Dune II".
Games on GitHub - List of popular/awesome videos games, add-ons, maps, etc. hosted on GitHub. Any genre. Any platform. Any engine.
Gameboy.Live - Basic gameboy emulator with terminal "Cloud Gaming" support.
HSTracker - Deck tracker and deck manager for Hearthstone on macOS.
Steam Database - Insight into the applications and packages that Steam has in its database.
TShock - Provides Terraria servers with server-side characters, anti-cheat, and community management tools.
GG| - Video Game Collection Tracker.
Factory Planner - Mod for Factorio. It allows you to plan out your production in detail.