feature	website
server rating (security)	check.messaging.one
server rating (usability)	gultsch.de/compliance.html
(partial) network map	network.trashserver.net
XMPP room search	muclumbus.jabbercat.org
XMPP room search	search.wensley.org.uk
XMPP room list	traffixpixel.tk/chatrooms
Clients supporting OMEMO	omemo.top