nostr:npub1yufhmd9xq7du2gdjsknkt8ylcj9hr5gx0s89lespnu0anqm005mqhxnqsu iOS Damus repo is open - check out github, or Will’s git to examine. Swift.

There is also notedeck, which is a work-in-progress, and unreleased. I’m not 100% sure, but I think it’s rust.

Finally there is nostrscript, which allows for wizardry in one or more languages in e.g. Damus. I’m not sure which ones.