Scratched my own itch on a few things recently ...
Simple mood/symptom tracker: https://howsyourblank.com
I have almost six months of data in it myself, and I am excited to see what my "year-n-pixels" looks like at the end of the year.
Leaderboard app: https://leaderboardhq.com
My family plays a card game that includes 9 rounds with a cumulative score. This app is tailored for that, but I made it generic enough with a few basic settings so that it can be pretty universally applicable.
Blog by sms/text: https://textpost.me
Saw another project like this, but built it out the way I wanted to see it work for me. Pretty much the only blogging/journaling practice that allows me to remain consistent.