Looks interesting, from the page (for those just browsing comments here): THUNDERBEAST GAMES began developing the Atomic Game Engine on November 12th, 2014 by

Looks interesting, from the page (for those just browsing comments here): THUNDERBEAST GAMES began developing the Atomic Game Engine on November 12th, 2014 by forking Urho3D. It was released under the permissive MIT license during GDC 2016. Atomic is now being used in production environments, has 30 contributors, and runs on Windows, macOS, Linux, Android, iOS, and WebGL!