Godot is a powerful cross-platform game engine
Fast and lightweight JavaScript game engine built on WebGL and glTF
Game engine supporting many 3D/2D formats and graphic effects
Real Time Strategy game engine supporting early Westwood classics
Open game and rendering engine packed into a JavaScript framework
Reusable code for building video games with Jogamp NEWT
lua dev plugin for unreal engine 4 or 5
Self-hosted CMS platform based on the Laravel PHP Framework
ThinkPHP Framework
CTFs as you need them
Orx: Portable Game Engine
Vivid3D is a C++ IDE/3D engine, with python scripting.
A free 3D game engine to create games and realtimes scenes for Windows
An isometric arcade-style game of skill, puzzles and exploration
Arianne is an engine to develop multiplayer online games like Stendhal
A Complete WebGPU Game Engine for Browser & Desktop Arcade Oriented
Amateur 3D Game Engine
PyCAPGE - Python Classic Adventure Point and Click Game Engine
SDL based generic 2D game engine
Old-school 2D game engine
A simple cross-platform game engine for creating old-school 2D games
OgreWin3D
Molecular viewer and prototyping framework
Vivid3D is an open-source 3D engine with powerful 2D UI.