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EudoraOSE (Open Source Edition)
EudoraOSE is a free-to-use derivative of the Eudora mail client that uses Thunderbird code with additional code, features and UI elements from Qualcomm's Eudora client.
It supports multiple syncing of accounts, and is available on Windows, Mac and Linux. It has a number of advanced features, such as message redirection, comprehensive session restore, advanced attachment handling and content display controls.
It also offers handy options like 'group selection' and 'type-to-select' for quickly finding and retrieving messages.
Screenshot: Ben Woods/ZDNet