Scratch - Scratch is the programming language & online community where young people create stories, games, & animations.
Rec Room - Rec Room is an Action, Role-playing, First-person Shooter, Sports, and Multiplayer video game developed and published by Against Gravity.
Tynker - Game Worlds for Kids to Learn Programming
Kit55 - The Dev Server GUI for Static Websites. Easy to use, super fast desktop app that will compile your html templates for you.
RoboGarden - RoboGarden provides a complete, game-based suite that teaches coding from beginner to professional level, starting with block programming and progressing to professional Python and JavaScript programming.
Kodeclik - Kodeclik is an online coding academy for Kids and Teens.