Nextool is a task manager that's based on the "Getting Things Done" methodology, but which adds new features that aren't possible with traditional pen-and-paper GTD.

EasyBusy is a productivity app that will help you keep all your tasks and ideas in one place, complete them on time and never forget anything, all that will fun and no stress!.

etm provides a simple but powerful way of organizing your events, tasks and other reminders. Multiple views, alerts, repetition and queries are supported.

Delphinus Notes is a freeware program designed to keep and manage notes. It contains simple notepad, calendar (with week schedule) and expenditure management module. All data can be encrypted and program can be protected by the password.

Too much to do? Too many lists for too many business and personal projects? Sort them once and for all online at ccToDo.com. ccToDo is the easy, cloud-based to-do list that follows you round wherever you go – on your iPhone and your computer, or anywhere with an internet...

Tasktops task-based approach to your work day reduces information overload, helping to make all of the time you spend on work meaningful. Tasktop makes this possible by

A self-hosted open source system for the long-term management of personal information. It is a combination of a web-based application intended for desktop use, and an Android mobile reader application.

From grocery shopping to completing work projects on time, no to-do is too small or too large for Todo Cloud. With more than 70 million tasks completed, Todo Cloud is one of the most popular, powerful and award-winning to-do list apps ever.

MiniTD is a todo and project management application for Windows. It takes a simplified approach towards the GTD way of handling things to be done.