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There's a lot of retro dev happening now across the board. SGDK has led to a big interest in making Genesis/Megadrive games. Jo Engine is increasing interest in the Saturn, etc. I'm also attempting to help contribute by writing a book on Neo Geo development (it has a long ways to go)
https://github.com/Stephane-D/SGDK
https://www.jo-engine.org/
a Saturn homebrew showcase - https://www.youtube.com/watch?v=NqKKExcTaKo
https://neobook.mattgreer.dev
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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The official Game Boy Programming Manual [0] leaked and is available at the Internet Archive. It's a great resource.
If you're just getting started with assembly and want to look at a short program, my maze generator [1] is available on GitHub with annotated source code.
[0]: https://archive.org/details/GameBoyProgManVer1.1
[1]: https://github.com/svendahlstrand/10-print-game-boy
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I believe the LR35902 SoC is exclusive for the Game Boy, but the actual CPU core, SM83, is probably used elsewhere. Sharp's datasheets [2] mention home appliances as intended application.
[2]: https://duckduckgo.com/?q=sharp+sm83+datasheet