Gaim for UNIX
Gaim is a multi-protocol IM client for Linux/UNIX, BSD, MacOS X, and Windows. Gaim users can log in to multiple accounts on multiple IM networks simultaneously. We can be chatting with our friends on AOL, Yahoo and IRC client at the same time.
Gaim is compatible with AIM (Oscar and TOC protocols), ICQ, MSN Messenger, Yahoo, IRC, Jabber, Gadu-Gadu, and Zephyr networks.
This new Skype for Mac offers you with popular new feature group video calling which allows you to make video calls with more than two people at a time, as long as all participants are on the new Mac beta or Skype for Windows 5.0.
New Skype 5.0 for Mac OS X (Beta) app has been brought together in one window for ease to use, and the Mac address book has been integrated, making it possible for you to call, Instant Messaging and SMS your contacts when they are online or offline.
imov Messenger for Facebook Chat
Make a chat from your Android Mobile Phone via Facebook with your Facebook Account is very easy to do. What you need is just Mobile Messenger Client for Android Phone which integrated or support Facebook Chat.
There is so many Facebook Chat for Android Mobile Client that you can choose to use. You can make a choice to use Free Android Facebook Chat client or use the Paid version of Facebook Chat for Android.