Cyberix3D - Free online 3D Game Maker. Make your own 3D games online!
Godot Engine - Feature-packed 2D and 3D open source game engine.
Open 3D Engine - Open 3D Engine is an open-source 3D game development engine in real-time.
GDevelop - GDevelop is an open-source game making software designed to be used by everyone.
Castle Game Engine - An open-source 3D/2D game engine for ObjectPascal.
Construct 2 - Scirra Construct is a 2D game development engine with a focus on building games visually.