There is a recent discussion on quora.com about this topic.

Amongst others, they discuss

  • AgileZen http://agilezen.com/
  • Blossom https://www.blossom.io/
  • Breeze http://letsbreeze.com/
  • Edistorm http://www.edistorm.com/
  • GreenHopper http://atlassian.com/
  • JimFlow http://jimflow.jimdo.com/
  • Kanban Pad http://kanbanpad.com/
  • Kanban Tool http://kanbantool.com/
  • Kanbanery http://kanbanery.com/
  • LeanKit Kanban http://leankitkanban.com/
  • Pivotal Tracker http://www.pivotaltracker.com/
  • Swift-Kanban http://www.swift-kanban.com/
  • Target Process http://targetprocess.com/
  • Trello https://trello.com/
  • Xamun http://www.xamun.com/
  • Eylean board Eylean – Agile tool, TFS integration, Kanban board, Scrum board

Most positive comments point to LeanKit when you need metrics and Trello when you don’t.