As a medical student, I'm making a site of free tools for medical trainees, the biggest being a rank list tool to balance logical factors and gut ranking as well as pairwise comparisons/maps/etc. https://medcompass.tools/rankcompass. Might adapt to other avenues to help people pick housing and other things that require ordered lists and decision tools!

I also make interactive tools for artists at https://artres.xyz.

I've been super inspired by all the amazing things I've seen on Hacker News.