Magic Mail Monitor (MMM)!

POP Peeper is an email notifier that runs in your Windows task bar and alerts you when you have new email on your POP3, IMAP (with IDLE support), Hotmail\MSN\LiveMail, Yahoo, GMail, Mail.com, MyWay, Excite, iWon, Lycos.com, RediffMail, Juno and NetZero accounts. IMAP supports allows you to access AOL, AIM, Netscape and other services. Send mail directly from POP Peeper and use the address book to email your frequently used contacts. POP Peeper allows you to view messages using HTML or you can choose to safely view all messages in rich or plain text. »

PopMan is a POP3 and IMAP4 manager. It can be used to list all e-mails received on your incoming mail server, without having to load these mails completely. Unwanted e-mails can be deleted directly from the server.

Have you fallen in love with the fabulous open-source email notifier program Poptray, created by Renier Crause? But you're running a newer version of Windows than PopTray was designed for? Or get lots of UTF-8 encoded emails from Facebook, Flickr, Pinterest, and so forth that don't display correctly in PopTray? Now there's a new option. Developer Jessica Brown has taken the open-source code from PopTray and built upon it to create PopTrayU. All the things you love about PopTray, minus a few things you didn't! »

nPOPuk is an ultra-small, but comprehensive, e-mail client that runs on a wide range of Windows-based operating systems

Mia is a native Gmail application on your Mac's menu bar!

Gmail Peeper is a free Gmail notifier program which provides an attractive and simple way to check for new mail messages without opening your browser!

Gmail Notifier Pro is a Windows application capable of checking multiple Gmail accounts for new mail and display notifications.

Howard is a replacement for the Windows Live Messenger email notification. A tooltip and a sound will notify you about a new email. The tooltip shows you the sender and email subject. Just click the tooltip or icon to open your inbox in your browser or Windows Mail. You can select the tray icon from several different styles.

GMDesk is an application that lets you run Gmail, Google Calendar, Google Docs and Google Maps as a stand-alone application to do all your mail handling, calendar event reading etc with. No need to open it up in a web browser, or have it clutter your workspace.

Gmail Notifr is written in RubyCocoa and has these features:

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 with new mail, space used, and new mail snippets.

Fastest Gmail is a handy and reliable extension designed to notify you about incoming emails from all your Google Mail accounts and labels.