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
Streak - Manage customers inside Gmail
Clean Email - Clean Email is an online service that empowers you to take control of your mailbox.
NetHunt CRM - Turn Gmail into a smart CRM
MailClark - The Slack bot for external communications
Instantly - Build your own infinitely scalable cold email outreach system with Instantly.