One intuitive workspace to manage your Emails, To-do's, Projects, Sales, Client Service, CRM and Teamwork ... right in GMAIL!
Drag for Gmail - Transform Gmail into organized To Do lists (like Trello)
HEY - Email at its best, new from Basecamp.
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.
Horde - Horde Groupware is a free, enterprise ready, browser based collaboration suite.
KanbanMail - A Kanban board for your emails.
InstAddr - Disposable email address application.