NewPipe - NewPipe is a lightweight YouTube front-end for Android.
Planniversary - Never forget a gift or a birthday / anniversary again 🎁📆
FreeTube - FreeTube is an open source desktop YouTube player built with privacy in mind.
Slack Birthday Bot - Slack bot for celebrating birthdays
Invidious.io - Invidious is an alternative front-end to YouTube.
hbd - birthday reminders for the people you actually care about.