Followup.cc is described as '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!'. There are more than 25 alternatives to Followup.cc, not only websites but also apps for a variety of platforms, including Google Chrome, Gmail, Mac and Windows. The best alternative is Gmelius, which is free. Other great sites and apps similar to Followup.cc are SalesHandy (Freemium), Prospect.io (Paid), Docsify (Freemium) and FollowUpThen (Freemium).
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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.
Mailreminder.net is the product of some of my own frustations with trying to remember stuff during the day. I have tried numerous todo list apps and websites to keep up with requests that end on my inbox.