Godot Engine - Feature-packed 2D and 3D open source game engine.
Erase All Kittens - The revolutionary online game that introduces children to computational thinking and professional coding languages.
GDevelop - GDevelop is an open-source game making software designed to be used by everyone.
Kodu Game Lab - Kodu lets kids create games on the PC and XBox via a simple visual programming language.
Construct 2 - Scirra Construct is a 2D game development engine with a focus on building games visually.
Tynker - Game Worlds for Kids to Learn Programming