Godot Engine - Feature-packed 2D and 3D open source game engine.
GDevelop - GDevelop is an open-source game making software designed to be used by everyone.
Unity - The multiplatform game creation tools for everyone.
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.
Scratch - Scratch is the programming language & online community where young people create stories, games, & animations.
ct.js - ct.js is a 2D game editor (desktop app) based on web technologies.