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.

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

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

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.

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

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