XThunderbird e-mail client is an extension that provides a full-featured e-mail client, RSS, and newsgroup client. The tool supports different mail accounts (POP, IMAP, Gmail). It has an e-mail account setup wizard, an address book, a user interface with tabs, an integrated spam filter, advanced search, and indexing and e-mail organization capabilities using tags and virtual folders.
Mia for Gmail (was Notifier Pro for Gmail) is a desktop Gmail client which sits politely in your menu bar.
