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
Sortd - Rated the #1 App for Gmail
MailClark - The Slack bot for external communications
Drag for Gmail - Transform Gmail into organized To Do lists (like Trello)
Clean Email - Clean Email is an online service that empowers you to take control of your mailbox.
Get My Receipts by cloudHQ - Organize your receipts in one click