A game engine with an emphasis on real-time cutting-edge solutions
Zig game engine & graphics toolkit
Game engine supporting many 3D/2D formats and graphic effects
A game engine powered by python and panda3d
Descent 3 by Outrage Entertainment
GemRB is a portable open-source implementation of the Infinity Engine
YimMenu, a GTA V menu protecting against a wide ranges
JavaScript-based game engine designed to empower developers
s&box is a modern game engine, built on Valve's Source 2
Godot game template and component-based framework
Fully async, multithreaded, predictive, open source, 3.01 reach
IsoCity: City building simulation game
3D game engine/framework in C, with Luajit and Python bindings now
Godot Minimal Theme
2D JavaScript Physics Engine
A 2D rigid body physics engine for the web
Minecraft server optimization guide
lua dev plugin for unreal engine 4 or 5
High performance UI layout library in C
Orx: Data-Driven Game Engine
Odamex is a free, cross-platform, modern client-server Doom engine
Arianne is an engine to develop multiplayer online games like Stendhal
Old-school 2D game engine