grexit.comSoftware by GrexIt Software
Front - multi-channel inbox service for collaborative teams
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
Mailor - Shared inbox, team portal and smart notifications
Missive - Team communication app now supporting FB, Twitter & SMS
Gmail Sender Icons - Know the sender's company by adding favicons to Gmail
HelpScout - Help Scout is a simple, straightforward way to provide excellent support