I'll drop some links here that can help you with your research. For an overview of the Nostr ecosystem:

GitHub

GitHub - aljazceru/awesome-nostr: nostr.net - awesome-nostr is a collection of projects and resources built on nostr to help developers and users find new things

nostr.net - awesome-nostr is a collection of projects and resources built on nostr to help developers and users find new things - GitHub - aljazce...

The following two links can help while checking out NIPs:

Nostr | NIPs

Documentation site for NIPs

NostrHub

NostrHub | Discover and Publish NIPs

Explore official NIPs and publish your own custom NIPs on NostrHub.

For tools (clients):

Explore Nostr Apps

Also, for a list of 'big tech' alternatives on Nostr, check this out (click on each logo to reveal the respective competing clients): https://noalt.app/