GB Studio, by Chris Maltby, is fairly well-known now, isn’t it? It’s a free and open source solution to fairly easily making Gameboy roms on your own, that are properly termed not romhacks but homebrew. It has its own website and it’s available on itch.io. It was what Grimace’s Birthday, which we linked to last year, was made with.
Now there’s a heavily-modified version of GB Studio, called BB Studio, that produces NES roms in a similar manner! It’s made by Michel Iwaniec, and can be gotten from Github here. It’s recommended that you be familiar with GB Studio first, and to read the list of caveats on the page. Particularly, the NES supports fewer sprites per scanline than the Gameboy hardware does, and runs at a slower clock speed. BB Studio is also “early alpha software,” meaning, it might or might not work well for you at the moment.
While we’re on the topic I should also mention NES Maker, which isn’t free, but it also isn’t “early alpha software,” and at $36 isn’t expensive either, and is custom-built for generating runnable NES games.
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