Write your game with TypeScript in UE or Unity
Diablo build for modern operating systems
Open-source engine for Heroes of Might and Magic III
Voxel game engine in C++ with OpenGL
Action RPG that's easy to mod
Command & Conquer: Remastered Collection
Code for Cicero, an AI agent that plays the game of Diplomacy
A free/open source client and automation tool for Ragnarok Online
3D game engine with lua scripting
3D Procedural Game Engine Using OpenGL
lua dev plugin for unreal engine 4 or 5
A multi core friendly rigid body physics and collision detection lib
Community effort to maintain and improve Jedi Academy (SP & MP)
Doom-based AI research platform for reinforcement learning
Orx: Portable Game Engine
RTSish Game Engine
Vivid3D is a C++ IDE/3D engine, with python scripting.
Cooperative multiplayer graphical RPG and adventure game
A free 3D game engine to create games and realtimes scenes for Windows
Simple 3d Top-Down Shooter & Free 3d Board Game
An isometric arcade-style game of skill, puzzles and exploration
Good-looking and addictive OpenSource games
Odamex is a free, cross-platform, modern client-server Doom engine
Animation Compression Library