corona game engine
Solar2D is a free and open-source, cross-platform software development kit.
It is coded using Lua.
Website: https://solar2d.com/
Other website: https://coronalabs.com/
Download: https://github.com/coronalabs/corona/releases
It was originally called Corona, made by Corona Labs Inc.
Now it's called Solar 2D.
Currently maintained by Vlad Shcherban.