static site
eg. nginx

Cloud storage - uploading and viewing your files remotely how to
eg. Nextcloud

Simple minecraft beta 1.7.3 server how to

Website on tor - host your website from home without worrying about the domain or revealing your IP address how to

Tor relay - help the tor network by hosting a tor relay. (Maybe try to avoid germany, netherlands and usa. There are already too much of tor relays in these countries) how to

Eepsite - almost like tor but even more decentralised how to

XMPP - federated communication protocol how to

Simplex SMP server - is the relay server used to pass messages in SimpleX network how to

Text board - a type of online forum that relies only on text
eg. kareha

Image board - a type of online forum that relies on images and text
eg. vichan

Oekaki board - bulletin board allowing artists to share their artwork. Drawing are usually made in browser by simple drawing program
eg. potiboard

Forum - no need to explain
eg. flarum , lemmy (it's more like reddit)

Invidious instance - youtube frontend how to

Pi-hole - your self-hosted private DNS how to

IRC - classic communication protocol how to