Gmail Notifier (by Doron Rosenberg)

This is a Firefox extension that allows you to manage multiple Gmail accounts and receive new mail notifications. It displays account details, including unread messages, saved drafts, spam messages, labels...

ePrompter automatically and simultaneously checks and retrieves your email messages from up to sixteen password protected email accounts and then gives you notification whenever you have new messages....

On DOW's website you can find some software for Windows, like Gdow 2007* and Gdow 1, two Gmail notifiers! *Gdow 2007 needs updating and cannot be downloaded

[b²] Gmail Notifier is a freeware Animated Gmail Notifier for Windows and MacOS - its based on Adobe AIR technology - with cool animations that will notify you about new …