Open-source Android/Desktop remake of Civ V
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Multi-platform 2D and 3D game engine
Cross-platform game engine in Rust
Free, cross-platform 2D game engine powered by Haxe and OpenFL
A dead simple 2D game engine for Go
Use the Delta Executor APK with Roblox on a Windows PC.
Orx: Portable Game Engine
A JavaScript game library to quickly develop board games for the web
Open-source, cross-platform, C++ game engine for creating 2D/3D games