Reality Factory - Reality Factory is a free suite of game development tools for building 3D games.
Roblox - Reimagining the way people come together.
CraftStudio - CraftStudio lets you craft games from scratch in real-time over the Internet.
Brick Hill - Brick Hill is the ultimate building block game, allowing you to push the limits of digital bricks and make your own games.
Limon Engine - Limon is a multi platform 3D game engine mainly focusing on first person games.
Crey - Platform for making games and experiences