This blogpost may be a bit old but is very valid as it goes through the points that an admin has to keep an eye on, verify the proper work and maintain regarding a Mastodon instance

Hugo based static page generator and blog with ActivityPub support

A curated list of server applications with support for the ActivityPub protocol (Fediverse network) and related standards.

Tag-indexed bookmarking, ActivityPub publishing (soon to be optional!) and simple commenting, also powered by ActivityPub (also optional)

Spawn a Nginx webserver with a bunch of static JSON files that behaves like a Mastodon instance

Thats a simples script to import yours tweets from any Twitter account to a Mastodon account, in any instance.

This program runs as a daemon (proxied by a TLS-enabled real httpd server) and provides the basic services for a Fediverse / ActivityPub instance (sharing messages and stuff from/to other systems like Mastodon, Pleroma, Friendica, etc.).