Proteus is an Instant Messenger that uses the IM framework libpurple and is written using Mac OS X's API Cocoa. Proteus attempts to bridge the gap between functionality and beauty, using native the Mac interface with a powerful core to get your hard core instant messaging done.
Multi-protocol
Proteus supports multiple IM protocols, so you'll never need to use two clients at once again.
Instant Messaging Standards Included
Contact Management, chatting features, away messages, etc. are included.
Extras for your Enjoyment
Extras allow you full customizable options in Proteus, so you can change your message views, icons, and sound packs.
Drag and Drop File Transfer
Proteus supports File Transfer, so you'll never need to use your email client again for quick transfers.
Delicious UI
An intuitive UI makes everyone happy, and makes your viewing pleasure easier.
Open Source
Open source for all those free lovers out there. Free is better, always.
Growl Notifications
Growl support for your IM alerts, adding on to what Proteus already provides.
Meta Contacts
Meta contacts for all your friends with more than one IM account that you need.
Mac OS Technologies
Proteus uses Mac OS X technologies like WebKit and Address Book to manage your message views and IM contacts.
UNIX Power
Being based on UNIX technologies, you can run shell scripts when people message you and much more.