This contains the map editor/engine and base gameplay code to make 2-D platformer games.  It’s not really ready for prime time open source yet, there’s no documentation and there are a lot of bugs still, so I’d be weary of anyone using it, but if you’re really really really enterprising, you might figure it out.  It’s written mainly using XNA/Winforms so it will only work on Windows.  There is a monogame based backend for publishing to the OUYA as well as a PSV port.

https://www.dropbox.com/s/78aj0hts7sh60ie/Stormbrewer.zip

I also made a script to import everything into Unity.  This contains the sample project.

https://www.dropbox.com/s/6t6hs6nav466e32/StormbrewerUnity.zip