Free and open source 2D and 3D game engine
Godot is an advanced, feature-packed, multi-platform 2D and 3D open source game engine.
Godot provides a huge set of common tools, so you can just focus on making your game without reinventing the wheel.
Godot is completely free and open-source under the very permissive MIT license. No strings attached, no royalties, nothing. Your game is yours, down to the last line of engine code.