Multi Theft Auto is a game engine
Free game engine for development of desktop, mobile, and web games
HTML5 Canvas Tower Building Game
A free/open source client and automation tool for Ragnarok Online
Jazz² Resurrection: Open-source reimplementation of Jazz Jackrabbit 2
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Gideros Release version
New Modpack with Gregtech, Thaumcraft and Witchery
Svelto ECS C# Entity Component System
Simple GTK# Paint Program
Skin changer for League of Legends (LOL)
The ioquake3 community effort to continue supporting/developing id's
Free, cross-platform 2D game engine powered by Haxe and OpenFL
The solution that allows unity games update in runtime
An OpenGL RTS game engine written in C
A game framework written with osu! in mind.
Open-source OpenGL/SDL2 reimplementation of Sid Meier's Alpha Centauri
3D Game engine with editor
A Flutter based game engine
KorGE Game Engine. Multiplatform Kotlin Game Engine & Korlibs
The flexible game engine
CTFs as you need them
Accuracy-focused XNA4 reimplementation for open platforms
Open game and rendering engine packed into a JavaScript framework