Flow-e is a visualization layer on top of your Gmail or Outlook inbox. It provides an elegant Kanban-like workflow that's combined with the ideas behind Inbox Zero and GTD. Flow-e eliminates the need of external task management tools and transforms your inbox into a central To Do app.
Sortd - Rated the #1 App for Gmail
fwrdto.me - Send web pages to your email inbox in just one click
Drag for Gmail - Transform Gmail into organized To Do lists (like Trello)
Jot - The no-fuss way to take notes
KanbanMail - A Kanban board for your emails.
Captio - Captio enables companies and their employees an improved control of their expenses and the discovery of new savings opportunities.