Instant Messaging

Just like Whatsapp but from your Mac's desktop

A traditional chat with group videoconferencing

Unofficial desktop client for Facebook chat

iOS's iMessage now also on Mac OS

Share files and chat with friends safely

A single program for all your IM accounts

Chat with friends on this multiplatform messaging client

Multiplatform IM client

Chat with your Yahoo and MSN Messenger contacts

An IM combo born of Mozilla and Pidgin

Talk to all of your MSN contact even with your Mac

Cooperative whiteboard and voice communication through Jabber

Add a bunch of improvements to iChat

AOL's instant messaging program

A Multiprotocol Instant Messenger client

Open Source alternative to chat with MSN contacts

A simple Jabber-based IM client