DRM remover of the SteamStub variants
A development environment focused on modding
LayaAir is an open-source 2D/3D engine
A generic, simple and fast implementation of Deepmind's AlphaZero
Desktop/Android/HTML5/iOS Java game development framework
A cross-platform PSP emulator
One framework for creating powerful cross-platform games
Fast and lightweight JavaScript game engine built on WebGL and glTF
The source code to VVVVVV
Open source simulation game based on Transport Tycoon Deluxe
dhewm 3 main repository
Open Source MMORPG Framework
Provides efficient allocation free async/await integration for Unity
3D game engine/framework in C, with Luajit and Python bindings now
A terminal based Pokemon like game
Mangos ZERO is a server for World of Warcraft
Enables Roblox developers to use professional software tools
Svelto ECS C# Entity Component System
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
The AWS GameKit Plugin for Unreal
0 A.D. is a free, open-source, cross-platform real-time strategy game.
An Open Source DOS emulator to run old DOS games
An award-winning drawing program for children of all ages
FlightGear Flight Simulator: free open-source multiplatform flight sim