Kiwi for Gmail - Dedicated Gmail client with clean integration of Google Calendar, Contacts, Google Drive, and...
PopTrayU - Have you fallen in love with the fabulous email notifier program Poptray, but you're running a...
Shift - Shift is the ultimate email client for managing Mail, Calendar, Drive, Slack, Asana, Jira, Evernote, and all your other favourite apps
Checker Plus for Gmail - Displays new emails and the sender's contact photo, get notifications or even listen, read or...
Unibox - Unibox is an application that aims to completely overhaul your email experience. Unibox resorts your email so that you can group the messages you receive by their sender. Read more about Unibox.
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.