1. 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.

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

  3. The simplest way to schedule an email reminder

  4. Gmelius brings your team together in Gmail. Your inbox is transformed into a light CRM and workspace of communication, collaboration, and automation. Gmelius is now also available on mobile for both iOS and Android.

    freemium $9.0 / Monthly

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

  6. A Kanban board for your emails.

    paid Free Trial $8.0 / Monthly

  7. Transform Gmail into organized To Do lists (like Trello)

  8. Schedule Emails in Gmail To Be Sent Later

  9. Turn your Gmail or Office365 inbox to a Visual Task Board.

  10. Sell smarter with email tracking and more

  11. Never-Forget.me is a delayed messaging service allowing you to compose email messages now which remain unsent as long as you click a link, at a recurring interval you specify, to continue to postpone the sending of your message

  12. Verify your email address lists with our drag and drop interface, or integrate into your app with our API. Prevent fake and bot account sign-ups by confirming your users are real humans with a real email address.