Free
ICQ
Free messenger and VoIP for Windows
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Enhance Your Skype Experience with Messenger Plus!
Encryption for your IM chats
Conduct video conferences with multiple users
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Save IM chat history online and access it from anywhere
Coccinella: A Free Instant Messaging Solution
Great utility for LAN communication
An AIM/iCQ alternative
Cheer up your email messages and IM chats
The first Christian messenger application
Multiple-mode network communication utility
Configure your own server