Godot is a powerful cross-platform game engine
The game engine for everyone
Solar2D Game Engine main repository (ex Corona SDK)
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
New Godot bindings for Swift
Cross-platform game engine in Rust
Multi-platform 2D and 3D game engine
KorGE Game Engine. Multiplatform Kotlin Game Engine & Korlibs
A completely free, open-source, 2D game engine
Open source library for creative expression on the web, desktop, etc.
A retro game engine for Python
Kotlin extensions for the libGDX game framework
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
Orx: Portable Game Engine
A Complete WebGPU Game Engine for Browser & Desktop Arcade Oriented
Game engine supporting many 3D/2D formats and graphic effects
A cross-platform, open-source, pure C game engine for mobile game
2D Game Engine
Cross-platform 2D and 3D game engine
A cross-platform 2D game engine
A fast, scalable, distributed game server engine/framework for C++
Free and Open Game Programming Language for Windows and GNU/Linux
Real-time RPG for PC/tablet/phone; multiple quests and random dungeons
Blueshift is a cross-platform 3D game engine implemented in C++