I'll start, I donate to a few regularly via Github sponsors. I like that it's recurring. I also donate one-off to ones as I come across them, but generally donate regularly to software I use regularly, particularly if I somehow am using that software to make money. I really like the idea of a portion of my donation going to upstream libraries, though tbh I'm not confident if Github sponsors does that or not.

I mostly donate w Bitcoin, except Github sponsors since they don't take it. I also donate to a few orgs like EFF and OpenSats which are OSS-adjacent or help OSS tools I like exist. When I see apps I like have published a new release and they announce it on nostr, I usually send them a bit via zap as well, but most apps I use aren't on nostr.