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

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

Juphy - Manage all your social media conversations, comments, reviews, and support requests in a single, shared inbox. Boost Sales on Social Channels via Messaging.

Nylas Mail - The Nylas Cloud API powers your application with email, calendar & contacts features. Built-in features for better email, calendar, and contact management.

Helpwise - Shared inbox for your team email addresses

DuoCircle - DuoCircle provides enterprise spam filtering and email management solutions.