Hey, all. Is there a Swift open source scene?

Hey, I've been a coder for more than 40 years now and I recently got dumped into early retirement. I had a couple of open source Mac projects written in Objective C in the late 90s early 00s but, you know, life.

So now I'm thinking about teaching myself Swift but the whole Apple Developer ecosystem is quite intimidating. Is that true? I'm not interested in writing stuff to sell, do I really need to buy a developer license?

EDIT: Thanks for all the encouragement, guys. I will definitely be installing XCode on my M4 MBP when it arrives on Friday!