https://xmpp.org
XSF is the foundation in charge of the standardization of the protocol extensions of XMPP, the open standard of instant messaging and presence of the IETF.
XMPP Standards Foundation
Hosts the markup for all XMPP Protocol Extensions.
xsf
xmpp.org website (builds: https://travis-ci.org/xsf/xmpp.org/builds)