Free
IRCScape
A free app for Windows, by Arphean Soft.
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LAN messenger with IRC functions
Speak to your friends over the Internet
Access Skype directly from MS Office
iTunes Script Plus Live Overview
Bring people together for a virtual conference
Instantly translate your ICQ conversations into different languages
Yahoo Messenger: Instant messaging app from Yahoo
A free program for Windows, by Send SMS Messages.
Customize Skype Status with Moodys Mood Messages
Call for free from anywhere
A simple, standalone Messenger clone
Effortless Recording with SuperTintin Skype Recorder