I’m not aware of any. Started tracker here
https://github.com/nostrability/nostrability/issues/85
Maybe nostr:npub1ye5ptcxfyyxl5vjvdjar2ua3f0hynkjzpx552mu5snj3qmx5pzjscpknpr knows some other apps?
Which apps support pinned notes (10001 events)? Pinning/displaying? Also pinning long-form content, not just kind 1?
I know of Nostrudel, but it doesn't let me pin long-form.
cc nostr:npub1zafcms4xya5ap9zr7xxr0jlrtrattwlesytn2s42030lzu0dwlzqpd26k5
Discussion
next version of noStrudel will support it https://github.com/hzrd149/nostrudel/pull/214
Although I don't know of any other apps