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
emailtopia Response - emailtopia Response makes inbound email management for group mailboxes easier.
Clean Email - Clean Email is an online service that empowers you to take control of your mailbox.
MailClark - The Slack bot for external communications
XgenPlus - World's reknown & trusted EAI (Email Address Internationlization) compliant Enterprise Email Hosting provider. Fast - Secure - Communicative - Collaborative - 99.9% Guaranteed Uptime.
CloudMagic for Mac - Simple, beautiful & blazing fast email app now on Mac.