I have so many options. Here's a top three

https://c50.fingswotidun.com/ useless but arguably art.

https://k8.fingswotidun.com/static/ide/ an ide,assembler,emulation for a fictional 8 bit computer.

https://github.com/Lerc/notanos A html/js desktop for Linux that I really should finish sometime.

These three projects have a combined user base in single digits. Mostly just me.