Taiga - Project management platform for agile developers & designers
buckets.co - Feature rich kanban board collaboration platform.
Hygger - Hygger - is an Agile project management tool with built-in prioritization.
TaskBoard - A Kanban-inspired app for keeping track of things that need to get done.
TargetProcess - Agile Project Management Web Application
Pintask - Pintask is the most customizable Kanban board.