Hiver - Manage Customer Support, Sales and Projects right from your Gmail inbox. Collaborate with Shared Labels, Shared Contacts, email notes, email reminders and email templates

PopTrayU - Have you fallen in love with the fabulous email notifier program Poptray, but you're running a...

Clean Email - Clean Email is an online service that empowers you to take control of your mailbox.

Checker Plus for Gmail - Displays new emails and the sender's contact photo, get notifications or even listen, read or...

MailClark - The Slack bot for external communications

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.