Mastodon Tools:

Instance Preview Tool: http://www.unmung.com/mastoview

Network Analysis: https://mnm.eliotberriot.com/dashboard/db/mastodon-network-overview

Instance List: https://instances.mastodon.xyz/list

Subreddit:
https://reddit.com/r/mastodon_social

Tampermonkey Script (max column width):
https://userstyles.org/styles/userjs/135501/Mastodon%20AutoResize%20Columns.user.js
(Must edit header to include the url(s) to your instance)

Twitter export:
http://mastodon-bridge.herokuapp.com/