Astro Messenger

Astro Messenger beats the other app with complement Facebook support. Group Chat

Adium

Adium is a free instant messaging application for Mac OS X that can connect to AIM, MSN, Jabber, Yahoo, and more.

Elegant Facebook Messenger desktop app

Tagged makes it easy to meet and socialize with new people through games, shared interests, friend suggestions, browsing profiles, and much more.

FBMessenger is a stand-alone Facebook Messenger app for Linux, very similar to the official…

Facebook Messenger is a faster way to message.

Facechat - Facebook dating. Meet new friends around the world. Free online chat rooms LIVE!

Fire is a multi-protocol instant messenger client for Mac OS X based on freely available libraries…

Lite version of Facebook Messenger

Pidgin is an easy to use and free chat client used by millions. Connect to AIM, MSN, Yahoo, and more chat networks all at once.

Pinger lets you text and talk free with the people you care about most, anywhere on the planet.

removes facebook from facebook so you can chat with friends without distractions.