A new Minecraft world editor and converter
The flexible game engine
Free game engine for development of desktop, mobile, and web games
Classic 2D side-scrolling platformer game
3D and 2D game engine written in Rust
3D Game engine with editor
Godot Minimal Theme
V1, Mirror Classic. V2, Mirror Engine: Join Discord for access
Cross-platform 2D game engine focused on ultimate productivity
Ct.js is a desktop game engine that makes learning programming fun
The source code to VVVVVV
KorGE Game Engine. Multiplatform Kotlin Game Engine & Korlibs
A permissions plugin for Minecraft servers
Stride (formerly Xenko), a free and open-source cross-platform C# game
The Tiny JavaScript Game Engine That Can!
Make Minecraft Java Edition mods, Minecraft Bedrock Edition Add-Ons
Fast and lightweight JavaScript game engine built on WebGL and glTF
Cross-platform 2D and 3D game engine with modular architecture
Cocos simplifies game creation and distribution with Cocos Creator
Action-adventure game originally released in 2013
A fresh & lightweight javascript game engine
Magic Another Game Engine
Minecraft map editor and mod
Descent 3 by Outrage Entertainment
Flexible level editor