Keep track of Internet traffic volume.
Make and receive phone calls and hold cross-platform webcam chats.
Hear, see, and chat with many people at a time.
Bayesian spam filter for most email clients.
Multi-protocol instant messaging client.
Integrate caller ID, address book, Google Voice, and Bluetooth on your Mac.
Auto record Skype phone and video calls.
Brings Gmail to your desktop.
Minimalist IMAP client with multitouch gestures.
Video chat/calling tool; see up to 6 friends at once.
Initiate phone calls from your Mac through your iPhone.
Instant messaging tool.