HareBoy – A Game Boy emulator written in Hare
Full Game Boy emulator in an obscure low-level language, but emulators already exist everywhere.

Game Boy emulator in Haskell is a rare stack choice that actually works in the browser.
Retro gaming enthusiasts, Haskell developers
EmulatorJS · SameBoy · Gambatte
Project repo og GitHub: https://github.com/pixel-clover/ocelot
Full Game Boy emulator in an obscure low-level language, but emulators already exist everywhere.
GBC homebrew craft is impressive, but demoscene constraint projects like this are a known category.
Game Boy emulator that works in Lambda and browser—portable, AI-assisted build.
Complete LLVM backend for Z80 outperforms SDCC, unlocks Rust on Game Boy.
Procedurally generated GBA puzzles that guarantee solvability without guessing.
WebAssembly port requiring you to supply your own legally-owned DUKE3D.GRP file.