Free
ChatStat
Contact your customers in real time as they visit your site
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IM client with multiple network support
Secure Instant Messenger and E-Mail Client
IMBooster: Enhance Your Instant Messaging Experience
Read Usenet posts and plunder binary groups
Free Instant Messaging App for Windows
AirTalkr: Free Chat & Instant Messaging Software for Windows
A free app for Windows, by mynetx Bumba.
Record Skype calls
A free phone for your computer
Add new winks to MSN Messenger
Mad Messenger Utilities Overview