Jabber

I get an error when I click on the register link.

I'd go to this their faqs link: http://www.jabber.org/faq.html and look at #13 and #24

(I'm going to move this to Software since someone may be able to give you some info if they've used this service.)

 

That is not what came up for me when I clicked on the link and in fact is an old notice (2013). Current notices are here: http://www.jabber.org/notices.html

Based on their notices, I'm not sure I'd be using the service though. There haven't been any in a year, which is probably not a good sign.