You can make it - Open Source MMORPG Platform
RTS game with the theme of Strategy by Design
FlightGear Flight Simulator: free open-source multiplatform flight sim
0 A.D. is a free, open-source, cross-platform real-time strategy game.
An elegant Go board and SGF editor for a more civilized age
An open source blooket auto-player / cheat
Bitburner Game
games for kids
Space shooter style game arcade version - Games/Entertainment Software
ZED OS the clone of Windows XP
A question-answer game for various trivia topics for road-trips
Baystation's flavor of Space Station 13
Multiplayer online game using Phaser + WebSocket (Socket.IO)
The best code this side of the galaxy
Edition of football teams on HTML canvas- javascript source
Open source script based on Master XLS
Next generation web chess club
Built to be ease of use, with no programming knowledge, Multi-platform
Paradise Station's GitHub main repository
PC adaptation of the favorite board game Timeline: Inventions
Mafia MMORPG Browser-Based game