Defold (App)
Defold is a free game engine that can be used for developing high-performance console, PC, mobile and even HTML5 web games.
Cocos Creator (App)
Cocos Creator is a free open source game engine that can be used to create 2D and 3D games, as well as interactive 3D applications.
GDevelop (App)
GDevelop is a lightweight open source game engine featuring a visual based event system that allows you to express complex game logic without having to write code.
Godot (App)
Godot is a free and open source game engine that can be used to develop both 2D and 3D games, and even XR apps.