MacBiff is a GPL'd Mac OS X "Biff" Program. It periodically checks your IMAP server for new email, and reports where in your folder hierarchy your new mail resides.
In the latest version an issue that stopped MacBiff from consistently retrieving passwords the from Keychain has been resolved and IMAP UTF7 support has been added.
Mia for Gmail (was Notifier Pro for Gmail) is a desktop Gmail client which sits politely in your menu bar.
