A lot, I don't list them in my resume or attach a title (founder, etc.), I just did it for the fun of it or to teach my son.

active & hiatus projects (published in Google Play & Apple App Store)

https://ABCDutch.app - Various Dutch learning apps I made for my son

https://ChronoBook.app - Muji Chronotebook for iPad

https://CloudArchitect.app (see wayback) - AWS/Kubernetes/Google/Azure Cloud Whiteboard Magnets for iPad

https://SketchDesigner.app - UI/UX design tool for iPad

PencilPuzzle - Over 25k+ puzzles, pictionaries, sudoku for iPad

sunsetted projects

https://PrintableFaceMask.com (see wayback) - last option printable origami Facemask to fight COVID-19

Various auto-generative NFTs (anon. around ~6k ERC-721 NFTs minted)

Too many. https://jjuliano.github.io/jjuliano/stuff-i-did.html