One intuitive workspace to manage your Emails, To-do's, Projects, Sales, Client Service, CRM and Teamwork ... right in GMAIL!
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
Polymail - Native email app for email productivity.
Drag for Gmail - Transform Gmail into organized To Do lists (like Trello)
Airmail for iOS - One of the best Mac email clients, now on iPhone
KanbanMail - A Kanban board for your emails.
New Gmail - The new version of Gmail web