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

EssentialPIM - EssentialPIM is a free Personal Information Manager that keeps up with the times and lets you manage appointments, tasks, notes, contacts, password entries and email messages across multiple devices and cloud applications.

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.

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

My Personal Kanban - This is a one page HTML/JavaScript application for people who would like to use simple and basic...

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