1. Boomerang for Gmail is a Firefox / Chrome plugin that lets you take control of when you send and receive email messages.

  2. FollowUp for email is a lightweight productivity suite that keeps your conversations and tasks from slipping through the cracks. Set perfectly timed reminders that arrive at the top of your inbox, right when you need them.

  3. Gmelius is a next-generation CRM and shared inbox for Gmail, tailored to the needs of SMEs that helps you sell more productively, organize and scale your pipeline, manage and build valuable customer relationships.

  4. At Mixmax, our mission is to change how the world communicates. We’re an email productivity platform that helps sales, customer success, and recruiting teams do their jobs better.

  5. Sales Engagement platform with bunch of sales engagement tools like Email Tracking, Document Tracking, Mail Merge etc. to boost sales teams productivity.

  6. Prospecting, like a boss. Find any email, reach out, measure everything and integrate with your CRM.

  7. Vocus.io is a productivity tool for Gmail available as a Chrome extension.

  8. Find out what happens to your emails after you press send! Add email tracking, attachment tracking, email scheduling and templates to your daily emails.

  9. Capterra helps millions of people find the best business software. With software reviews, ratings, infographics, and the most comprehensive list of the top business software products available, you're sure to find what you need at Capterra.