One intuitive workspace to manage your Emails, To-do's, Projects, Sales, Client Service, CRM and Teamwork ... right in GMAIL!
Taskful - Deadlines, meet your match.
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.
Calendarist - Time blocking companion for Google Calendar
Drag for Gmail - Transform Gmail into organized To Do lists (like Trello)
Gone - An ephemeral to-do list
KanbanMail - A Kanban board for your emails.