I wrote some software.

Android

	Foto Timer for Android is a timer app, based on the old Foto Timer app for Palm OS I published in the 90s.
	Meditation Timer for Android is based on the old Meditation Timer app for Palm OS. Meditation Timer for Wear OS can be used with Meditation Timer for Android for a timer on your wrist.
	J-K Bike Mechanical Disaster Prevention is an app that helps with the maintenance routine for your MTB or road bike.
	Immich Uploader is a small app that can upload images and videos to an Immich server.
	Gym Bott is a local-only exercise and routine tracking app designed to organize gym workouts in a simple and structured way.

I am currently publishing the Android apps on F-Droid.

If you own an Android phone, and you like using free, open source software, and you value freedom of choice, be advised that Google is planning to lock your phone down.

keepandroidopen.org has more information and some things you could do, whether you are a user or are otherwise invested.

Palm OS

(Granted, this is a bit old)

	Foto Timer for Palm OS - the original!
	Meditation Timer for Palm OS - a spin-off with easier UI

Firefox Extension