For the past ~6 years, I've been building and maintaining a website for a text-free visual programming language called BlockStudio at:

https://www.blockstud.io

The site has < 10 monthly active users on average, but they're middle-school (or younger) kids, and some of them have been using it for years now! It brings me great joy to work on it in the evenings whenever I can make time for it.

[Edited to add an example]

Here's one of the regulars:

https://blockstud.io/profile/15572