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There is also &!, which was featured on HN a while back: https://andbang.com/ https://andbang.com/

• alanmeaney 15y ago
  They are similar but their pricing will prevent the kind of adoption rates Trello are looking for - 100 million+
  • michokest 15y ago
    There's also http://teambox.com http://teambox.com with freemium approach. The new beta has a kanban-style view, too.