Those links would have been clickable if you hadn't put four spaces in front of them.

Jabber yes, Trillian no.

Trillian is basically the same as Pidgin, one client implementing multiple incompatible protocols.

Jabber is the originator of XMPP.

Insanely both Google and Facebook used XMPP for a while, but then turned off federation (allowing someone on Facebook to message someone on Google).