Godot – Free and open-source 2D and 3D game engine for multiple platforms

Godot is a completely free, open-source, cross-platform, and lightweight 2D + 3D game engine. It started as a 2D game engine, but later expanded its capabilities for 3D game development. Compared with many other game engines, it is small in size, rich in features, simpler and easier to use, and more friendly to the novice game makers. The games made with Godot can be simultaneously released to Windows, Mac, Linux, Android, iOS, UWP, and HTML5 platforms.