OctroTalk download

A Jabber/Gtalk client with support for Google Talk (GMail) audio & video calls.
Download from the developer's website

Alternative apps

Adium
Adium
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Popular and, probably, the best instant messaging client for you Mac.

Tor Messenger
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Tor Messenger--based on Instantbird...

Jibber Jabber
Jibber Jabber
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Write secret messages to your friends. Only you and your friends will be able to read them! Jibber Jabber is freeware.

VoIP Tracker Lite
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Keep track status directly from your Mac desktop.

Nightmares from the Deep: The Siren's Call
Nightmares from the Deep:
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Travel to the dangerous depths of the ocean and face Davy Jones.