No specific info about version 5.8. Please visit the main page of BeeBEEP on Mac Informer.
iMessage lets you send messages to anyone on a Mac, or an iPhone, iPad, or iPod touch running iOS 5.
Access multiple web-based services from a single application.
An unofficial and privacy-focused Facebook Messenger application.
Tor Messenger--based on Instantbird...
CometChat Messenger is a professional chat application for Mac.