RPG Maker - Make your own PC game with RPG Maker. Our easy to use tools are simple enough for a child, and powerful enough for a developer. Try it free today!
Godot Engine - Feature-packed 2D and 3D open source game engine.
GDevApp - Create your own games with GDevelop: an open-source game creator. No programming skills are required! Quickly build and share your games on mobile (Android and iOS), desktop and on the web.
RPG Paper Maker - Website
RPG Playground - Make your own Role Playing Games, fast and easy.
Adventure Game Studio - Adventure Game Studio provides the tools to make your own adventure, for free!