TeuxDeux is described as 'A simple todo-List manager with a focused clutter-free design to help you get things done' and is an app in the Office & Productivity category. There are more than 100 alternatives to TeuxDeux for a variety of platforms, including iPhone, Mac, Online / Web-based, Windows and iPad. The best alternative is Simplenote, which is both free and Open Source. Other great apps like TeuxDeux are Todoist (Freemium), Org mode (Free, Open Source), Remember The Milk (Freemium) and Taskwarrior (Free, Open Source).
Remember is a to-do list application, focused on being straightforward and non- disruptive. We dont believe in clunky applications where task management itself becomes a task. Remember is a simple list of tasks, always available at your fingertips.
In the spirit of Notational Velocity, Nottingham is an elegant notepad for Mac OS X. Designed to be lightweight and easy to use, it's a breath of fresh air perfect for storing whatever is on your mind.
MemoPad is software that comes with your Blackberry: it allows you to make notes, but not edit files. The MemoPad is a great tool for carrying letters, or information that you may want to cut and paste into emails.
TodoPaper is a simple, lightweight, and easy to use to-do list application for Windows. TodoPaper records your to-dos with the flexibility to make your to-do list as simple or as detailed as you desire.