TaskBoard - A Kanban-inspired app for keeping track of things that need to get done.
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.
LeanKit by Planview - See how Planview LeanKit enables engineering teams across all levels of the organization with a visual work delivery tool to apply Lean management principles to their work, helping them work smarter and deliver faster.
Planyway - Visual project management for Jira and Trello: manage resources, build project roadmaps, use time tracking.
Pintask - Pintask is the most customizable Kanban board.
Wiplo - The easiest way to organize and run your business workflows.