Remail.io!

FollowUp.cc was created to let people attach reminders instantly to any email. Since then, users have been scheduling their to-do list, scheduling tasks for others and keep conversations on track!

MailTrack.io is an email tracking app for Gmail that lets you know if the emails you’ve sent have been read or not. Mailtrack extension adds the double check marks to your Gmail.

BananaTag lets you easily track your emails, so you can see who has opened them and clicked your links. Our real-time metrics allow you to better manage your daily emails.

Rebump sends friendly follow-up messages to your email recipients for you. These automated emails are customized to appear as if you sent the email yourself. You can track and analyze all of your follow-up emails with your Rebump account.

SalesHandy is sales engagement platform. It provides email tracking, mail merge, document tracking & email scheduling. It allows user to send mass personalized email using mail merge, from gmail or their own SMTP servers.

Email and document tracking service. Email notifications, and/or SMS/ICQ instant messages when email they've sent gets opened, and can even track reads of attached files such as PDF, MS Word and Excel documents.