A game engine with an emphasis on real-time cutting-edge solutions
Zig game engine & graphics toolkit
A game engine powered by python and panda3d
Game engine supporting many 3D/2D formats and graphic effects
GemRB is a portable open-source implementation of the Infinity Engine
YimMenu, a GTA V menu protecting against a wide ranges
Real Time Strategy game engine supporting early Westwood classics
Action RPG that's easy to mod
s&box is a modern game engine, built on Valve's Source 2
A dead simple 2D game engine for Go
Descent 3 by Outrage Entertainment
IsoCity: City building simulation game
Godot game template and component-based framework
Fully async, multithreaded, predictive, open source, 3.01 reach
3D game engine/framework in C, with Luajit and Python bindings now
Godot Minimal Theme
2D JavaScript Physics Engine
Minecraft server optimization guide
JavaScript-based game engine designed to empower developers
High performance UI layout library in C
Orx: Data-Driven Game Engine
A modern, cross-platform Quake game engine based on FitzQuake.
Arianne is an engine to develop multiplayer online games like Stendhal
Good-looking and addictive OpenSource games