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