If you look on google,you'll find thousands of game engines,and a lot of them free,however I wasn't able to find what I was looking for.Does anyone know a 2D engine with basic physics and a level editor? I want to create a sidescroller.

Also: if it would use c++ and not some other scripting lang like lua,it would be perfect.

Perhaps Frank Engine suits your needs?

that's just pure gold,all those features nicely packed,and MIT license? Thanks a lot!