KanbanMail takes your inbox from a confusing mess and turns it into a clear action plan!
KanbanMail has gone through lots of improvements and optimizations throughout the last year. If you are looking for a way to optimize your email workflow, you should give it go.
Sortd - Rated the #1 App for Gmail
Mailtrack.io - The best email tracking solution I've found. Free
Drag for Gmail - Transform Gmail into organized To Do lists (like Trello)
ReadNotify - ReadNotify enables the user to know when email is sent and the reciever reads the email.
Flow-e - Turn your Gmail or Office365 inbox to a Visual Task Board.
Bananatag - Find out what happens to your emails after you press send! Add email tracking, attachment tracking, email scheduling and templates to your daily emails.