I have made dozens of websites which exist as self-contained solutions to a very specific problem. Namely I often try to leverage big data - whether it be chord progressions, piano locations, book ratings - to produce useful solutions to problems or as exploratory experiments.
Personal audio streaming made really easy.
A website to find every public piano.
Find charities that double your donation.
Connect a norns device through the internet.
A website with the probability of every chord progression.
Create patches for OP-1 and OP-Z instruments.
Host websites in your browser.
A website for sharing files.
Using AI to find new books.
Browser-based offline-first secure notepad.
A minimalistic website for making notes.
A website that finds road trip stops.
Calculate time and cost for generating many recipes from scratch.
The best pastebin for markdown notes.