Scratch - Scratch is the programming language & online community where young people create stories, games, & animations.
Run Marco! - Embark on a programming journey with Marco and learn to code!
Cyberix3D - Free online 3D Game Maker. Make your own 3D games online!
Rec Room - Rec Room is an Action, Role-playing, First-person Shooter, Sports, and Multiplayer video game developed and published by Against Gravity.
Open 3D Engine - Open 3D Engine is an open-source 3D game development engine in real-time.
Kit55 - The Dev Server GUI for Static Websites. Easy to use, super fast desktop app that will compile your html templates for you.