Godot Engine - Feature-packed 2D and 3D open source game engine.
Project Anarchy - Project Anarchy is a complete end to end game engine and state-of-the-art toolset for mobile.
GDevelop - GDevelop is an open-source game making software designed to be used by everyone.
Roblox - Reimagining the way people come together.
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.
Limon Engine - Limon is a multi platform 3D game engine mainly focusing on first person games.