kanban tools

LeanKit

http://leankit.com/

KanbanFlow

https://kanbanflow.com/

AgileZen

http://www.agilezen.com/

Kanbanize

https://kanbanize.com/

Kanbanery

https://kanbanery.com

JIRA Agile

https://www.atlassian.com/software/jira/agile

Kanban in Team Foundation Service

http://www.visualstudio.com/en-us/get-started/work-from-the-kanban-board-vs

Huboard (GitHub)

http://huboard.com/