what is jabber application
Jabber.org is the original IM service based on XMPP and one of the key nodes on the XMPP network. To log in, use an IM client like Adium, ChatSecure, Conversations, Gajim, Jitsi, Messages, Pidgin, Psi, or Swift (a full list is here). This service is run by volunteers, with hosting by USSHC, and software from Isode.