Is there NIP-pedia somewhere beside github?
I think nostr:npub1l2vyh47mk2p0qlsku7hg0vn29faehy9hy34ygaclpn66ukqp3afqutajft is right; NIP-89 is the final missing piece and the need of the moment.
Personally, I don't understand why it's not our top priority to bring all these micro apps together and prevent them from fading into obscurity because nobody even knows they exist.
On my part, NostrNet.work will support NIP-89 for both app list and its built-in search.
If you want to understand NIP-31, NIP-89, I highly suggest you go through this blog post. It's very well written.
