I use BORGChat, which hasn't been updated in ages, overall works well but occasionally crashes and does work with Windows 8.1. It's, of course, free (although donations are probably appreciated.)

http://borgchat.10n.ro/news.php?lang=eng


Wendell
Pediatrician in Chicago

The patient's expectation is that you have all the answers, sometimes they just don't like the answer you have for them