Real-time Strategy
Real Time Strategy game engine supporting early Westwood classics
s&box is a modern game engine, built on Valve's Source 2
Widelands is a free, open source real-time strategy game
One of the best Prodigy hacks
Endless Sky is a sandbox-style space exploration game
Build multiplayer web games played by millions
Free and open source real-time strategy game
Open source Old School RuneScape client
Open source clone of the Age of Empires II engine
YimMenu, a GTA V menu protecting against a wide ranges
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
A modular Common Lisp game engine
Games for tomorrow's programmers
V1, Mirror Classic. V2, Mirror Engine: Join Discord for access
A game engine with an emphasis on real-time cutting-edge solutions
A refreshingly simple data-driven game engine built in Rust
Voxel game engine in C++ with OpenGL
A bridge/proxy allowing you to connect to Minecraft
Distributed server for social and realtime games and apps
A free and open-source Touhou Project fangame
PoC Minecraft client written in Javascript
Gideros Release version
A charting and data visualization library for Unity
Stride (formerly Xenko), a free and open-source cross-platform C# game