Trelloist - A Kanban board for Todoist
Sortd - Rated the #1 App for Gmail
KanbanMail - A Kanban board for your emails.
Kanban Tool - Simple and effective online application for visual project management.
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.
Kanbanote - Turn your Evernote into Trello