Pretty fun to use it to create some games, highly recommended for beginners
Godot Engine - Feature-packed 2D and 3D open source game engine.
Scratch - Scratch is the programming language & online community where young people create stories, games, & animations.
Cyberix3D - Free online 3D Game Maker. Make your own 3D games online!
Blockly - Blockly is a library for building visual programming editors.
Unity - The multiplatform game creation tools for everyone.
EduBlocks - Making the Transition from Scratch to Python easier.