Chat & IM

Megafon
Call4mac(Trial version)
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A trial version app for Mac, by Call4mac.
FunkeeStory
Funkeemonk(Trial version)
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FunkeeStory: Instant Message Backup for Your Treo
Tweetie
Atebits(Trial version)
Download
Excellent Twitter client exclusively for Mac
BitTorrent Bleep
BitTorrent(Free)
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BitTorrent Bleep: A Free Internet Program for Mac
iModz
Imodz(Free)
Download
Customize your iChat status
Message2net
Novamedia(Trial version)
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SMS and Phonebook Management Made Easy with Message2net
Whistle Phone
Vail Systems Inc.(Free)
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A free program for Mac, by Vail Systems Inc..
ShowMacster
Showmacster(Trial version)
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A trial version app for Mac, by Showmacster.
More iChat Smileys
Lemacenligne(Free)
Download
More iChat Smileys: 120 New Emoticons for Chat Clients
iTwist n' Go
Itwistngo(Trial version)
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iTwist n' Go: One-Click Calling and Answering