The Ren'Py Visual Novel Engine
Flax Engine, multi-platform 3D game engine
The game engine for everyone
Open game and rendering engine packed into a JavaScript framework
Ct.js is a desktop game engine that makes learning programming fun
Powerful, mature open-source cross-platform game engine for Python
A modular Common Lisp game engine
JavaScript-based game engine designed to empower developers
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
Cross-platform 2D game engine focused on ultimate productivity
A game framework written with osu! in mind.
Cross-platform 2D and 3D game engine with modular architecture
Stride (formerly Xenko), a free and open-source cross-platform C# game
3D Procedural Game Engine Using OpenGL
The open-source Roblox & UEFN alternative
Visual Basic 6 2D online adventure game engine
Portable version of the incredible Godot Game Engine
Ze Text Adventure game Builder : Create as you play !
PyCAPGE - Python Classic Adventure Point and Click Game Engine
A free 3D game engine to create games and realtimes scenes for Windows
MIT Licensed Open Source version of Torque3D from GarageGames
Opensource crossplatform Fallout 2 game engine writen in C++ and SDL
Vivid is a modern C++ 3D engine using OpenGL4+
2D Game Engine with Lua Scripting made on top of SFML
Web powered cross-platform 3D, WebXR game engine