Checker Plus for Gmail - Displays new emails and the sender's contact photo, get notifications or even listen, read or...
Mia for Gmail - A desktop email client for your Mac, without a browser !
POP Peeper - POP Peeper is an email notifier that runs in your Windows task bar and alerts you when you have new...
Gmail Notifier (restartless) - is a highly customizable browser extension that notifies you about the incoming emails from all your Google-Mail accounts and labels. Gmail notifier is available for Firefox, Chrome, Opera and Safari.
PopTrayU - Have you fallen in love with the fabulous email notifier program Poptray, but you're running a...
Google Mail Checker - Displays the number of unread messages in your Google Mail inbox.