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NESFab – A new programming language for creating NES games

djmips

I've been using this and it's a lot of fun

snvzz

The code is GPLv3: https://github.com/pubby/nesfab/blob/master/COPYING

While software made using this SDK can be any license, as stated in the readme:

>TL;DR: If you make a game using NESFab, your code can remain private, and you do not need to include attribution in your binary release.