Free
IRCScape
A free app for Windows, by Arphean Soft.
Your download will start automatically. If it doesn't, restart it.
LAN messenger with IRC functions
Speak to your friends over the Internet
Access Skype directly from MS Office
Call for free from anywhere
Customize Skype Status with Moodys Mood Messages
Bring people together for a virtual conference
iTunes Script Plus Live Overview
Instantly translate your ICQ conversations into different languages
A simple, standalone Messenger clone
Yahoo Messenger: Instant messaging app from Yahoo
A free program for Windows, by Send SMS Messages.
Effortless Recording with SuperTintin Skype Recorder