"Homebrew" is a bit of a misnomer. Traditionally, if a game development studio wanted to make a game they would obtain debug hardware from a console manufacturer and use that to produce a product to be sold at retail. A hobbyist interested in running their own code on a console may run into difficulty, since doing so would require bypassing licensing requirements and anti-piracy measures. Just like brewing your own beer at home, it's technically not illegal to run your own code on hardware you've purchased, but likewise it's not exactly commercially viable either.
In any case, open development tools for many retro consoles have made homebrew easier than ever. The following is a non-exhaustive list of homebrew titles.
Sega Master System / Game Gear
| Heroes against Demons
| An impressive Puzzle Quest style game.
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| Mai Nurse
| If Dr. Mario was not shackled to Nintendo consoles would he be a cute anime girl? Evidently, yes.
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Sega Genesis / Mega Drive
Sega 32x
| Sonic Robo Blast 32x
| An ambitious port of the classic Sonic fangame to Sega's misbegotten half-console.
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Super Nintendo Entertainment System
| Dottie Dreads Nought
| Help a witch find Edelweiss in the mountains in this cute platformer!
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| Dottie Flowers
| Help a witch blast dudes in this cute horizontal shooter!
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| Supercooked
| A demake of hit party game Overcooked for the Super Nintendo. Supports four players with the Multitap!
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Game Boy Color
| Piropa
| Take care of a frog friend!
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