Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
PopTrayU - Have you fallen in love with the fabulous email notifier program Poptray, but you're running a...
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Checker Plus for Gmail - Displays new emails and the sender's contact photo, get notifications or even listen, read or...
eM Client - eM Client is a fully-featured email client for Windows and macOS with a clean and easy-to-use interface. eM Client also offers features for calendars, tasks, contacts, notes, and chat.
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.