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.
KanbanMail - A Kanban board for your emails.
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Sortd - Rated the #1 App for Gmail
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Drag for Gmail - Transform Gmail into organized To Do lists (like Trello)
Campaign Monitor - Email marketing software built for designers and their clients to run successful email campaigns.