Roblox - Reimagining the way people come together.
Reality Factory - Reality Factory is a free suite of game development tools for building 3D games.
KoGaMa - Kogama is a Massively Multiplayer Online, Sandbox, City-Building and Adventure-based video game.
CraftStudio - CraftStudio lets you craft games from scratch in real-time over the Internet.
HiberWorld - HiberWorld is a website that allows you to make and play 3D levels for speedrunning
Limon Engine - Limon is a multi platform 3D game engine mainly focusing on first person games.