Here is a list of Nostr Apps that I've been working on directly in the past 2 years:
Nostribe: X on Nostr
Pinja: Pinboard on Nostr
Docstr: Google Docs on Nostr
Pinstr: Pinterest on Nostr
Groups: Telegram on Nostr
OPAL: Ending homelessness with Nostr & Bitcoin
NostrPlayground: Query relays with beauty