ICQ

iChat is an instant message client from Apple Inc. It supports various protocols...

Adium is a popular and, probably, the best instant messaging...

One of the internet's first instant messengers, that has evolved into a personal communications center...

Nimbuzz is everything you need to communicate for free. Here is what you get...

Trillian is a chat application that tries to integrate most of the major chat networks...

Mail.Ru Agent provides an ability to exchange instatnt messages between your friends...

qutIM is free and open-source multiprotocol (ICQ, Jabber, Mail.Ru, IRC, VKontakte) instant messenger...

Icy Juice is a Cocoa-based ICQ Internet chat client that support multiple accounts...

Jitsi (previously SIP Communicator) is an audio/video and chat communicator that supports protocols such as SIP, XMPP/Jabber...

Psi is an instant messaging client supporting the XMPP protocol, which makes it compatible with a large number of messaging...

Mobiola WebCamera for iPhone lets you use Your iPhone as a Webcam! Turn your iPhone...

Fire is a multi-protocol instant messenger client for Mac OS X...

Proteus...

iCamMaster is a internet application specialized in collecting, viewing...

Syncman synchronizes your Mac's built-in Address Book with your Gmail...

The interface is very ICQ-like. Alerts appear in the contact list when events are received, and things like...

Mobiola Headset allows recording of Skype and other calls and transforms your iPhone and iPod Touch into a PC...

Cross-platform file transfer program for Mac OS X...

Kopete is an instant messenger supporting AIM, ICQ, Windows Live Messenger...

PGPTools is a mobile multiplatform encoder of text messages for your mobile device. With this application...