LDAPManager is an open source Cocoa application, written in Objective-C, to provide an LDAP browser/editor with a native Mac OS X interface. Should work fine on Tiger and Panther, and perhaps earlier. Download the program and his open source from the sourceforge site.
Attachment Tamer gives you control over attachment handling in Apple Mail.
qutIM is free and open-source multiprotocol (ICQ, Jabber, Mail.Ru, IRC).
With Livescribe Connect for smartpen, you can send notes and audio as pencast.
Chat application that tries to integrate most of the major chat networks into one application.
iGlasses helps you enhance the appearance of your video chats.
Make voice and video calls and send messages from your Mac.
Stay connected with customers, suppliers, and partners.
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