SalesHandy
Freemium
SalesHandy email tracking tool for Gmail allows you to know whether your sent emails have been read or not.
Kayako
Commercial
Kayako is a customer service software.
Boomerang
Freemium
Boomerang adds scheduled sending and the easiest, most integrated email reminders to Gmail, helping you reach Inbox Zero.
Followup.cc
Commercial
FollowUp for email is a lightweight productivity suite that keeps your conversations and tasks from slipping through the cracks.
Compare Gmelius with alternatives
Compare Followup.cc and Gmelius and decide which is most suitable for you.