Superpowers is an open source game creator to make both 2D and 3D indie games complete with real-time collaboration.It is built with Web technologies providing an extensible infrastructure for all kinds of collaborative tools.You can jam together in real-time, and your teammates don't need to install anything because they just need your project's URL and the password.No Internet connection is required because your projects are stored on your computer.When your game is completed, you can export games to Windows, OS X, Linux, Android or iOS.Superpowers come with a host of plugins allowing you to leverage the JavaScript ecosystem.Instead of screenshots, this video gives Superpowers a nice overview: