Serverside

Awesome Open Source
This Youtube channel reviews webapps you can selfhost
https://www.youtube.com/@AwesomeOpenSource

Selfhosting the Fediverse

Fediverse.party
This site tracks the vast amount of Fediverse-connected software out there
https://fediverse.party/en/miscellaneous/
Explore by category: https://fediverse.party/en/miscellaneous/

Awesome Fediverse
Curated list of Fediverse-connected software
https://github.com/emilebosch/awesome-fediverse

Development

ActivityPub.rocks
ActivityPub is an official W3C recommended standard published by the W3C Social Web Working Group
https://activitypub.rocks/

The Zot Communications Protocol
"Zot! is a communications protocol for social communications on the web. The protocol consists of two basic functions: send-message and remote-access."
https://wiki.p2pfoundation.net/Zot_Communications_Protocol

The Nostr Protocol
A simple, open protocol that enables a truly censorship-resistant and global social network.
https://nostr.com/