I’ll start by plugging Harvard’s free courses catalog as well as Udemy
Edit: Gonna add 2 more I remembered-
Blender - I wish I had more time to learn it, but I did start the infamous “Donut Tutorial” once!
Watch Cartoons Online - Lots of good older stuff!
Got to say Keepass, Open source Password Manager. And Internet Archive, a non-profit library of millions of free texts, movies, software, music, websites, and more 😊