Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists. It is designed for composite tasks, and also offers effort tracking, categories, notes and more.

Any.do is an award-winning app used by millions of individuals, families and teams to stay organized and get more done.

MyLifeOrganized (MLO) is a personal task outliner and to-do list manager which will help you to organize your goals, projects and tasks into a tree.

Nozbe is a task and project management app for individuals and small to medium-sized businesses. It serves as a hub for managing business goals, projects, discussions, files, and deadlines. Users can share projects, delegate tasks, and comment, enabling goal achievement from...

Experience Condution, a powerful yet incredibly simple check-list application that supports your needs from study, business, and life. Bring Condution with you across the Globe and let it be your second brain — so you can focus on living your best life.

Simple GTD application to manage your tasks and to-dos. Syncs with web server. Complete with the usual Inbox, Today, Next, Tomorrow, Scheduled and Someday "buckets" as most GTD programs have. You can also create Projects for tasks with multiple steps.

Mad Productivity offers a sleek and stylish but still work-focused take on task management. The native app provides note taking, to-dos, reminders and time tracking bundled in a fast and intuitive design.

Track your tasks and projects in a plain text file, todo.txt. A todo.txt is software and operating system agnostic; it's searchable, portable, lightweight and easily manipulated.

Todo app that uses cognitive psychology to trick brain into completing tasks and feeling good about it

Having trouble managing a busy team or staying on top of everything happening at work?

ThinkingRock open source and multi-platform software for Getting Things Done - the stress-free productivity methodology and international best selling book by David Allan. [ http://en.wikipedia.org/wiki/Getting_Things_Done ]

Conqu is an easy to use yet powerful task management tool designed to help you conquer your inbox and get things done. With Conqu, you can organize the tasks by criteria that makes sense to you and then find the right task to do at the right time and place.