I built https://suitocracy.com very slowly over the last few years. It is for collating information on the ethical conduct of large corporations, as well as rating and ranking them on various criteria.

It'll never make money, but it has been a good project for me to modernise my web development skills which had gone rusty over the preceding decade. I also took the opportunity to learn NGINX and a few other things that I hadn't really been exposed to beforehand.