Pintask - Pintask is the most customizable Kanban board.

Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.

TaskBoard - A Kanban-inspired app for keeping track of things that need to get done.

Task Coach - Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists.

buckets.co - Feature rich kanban board collaboration platform.

Strikethru - Strikethru is a kind of to-do list notebook for managing work lists and staying updated with the important tasks.