Cocos simplifies game creation and distribution with Cocos Creator
Voxel game-creation platform with easy modding and game creation
Open-source Android/Desktop remake of Civ V
Multi-platform 2D and 3D game engine
Free, cross-platform 2D game engine powered by Haxe and OpenFL
Godot Kotlin JVM Module
GameServer is a sophisticated, game server designed for online games
The AWS GameKit Plugin for Unreal
A multiplatform Dart movie app with 40% of code sharing
Hungry Hero is an open source Flash game built on Starling Framework.