Wunderlist

Wunderlist is a very simple, well designed and easy-to-use task management tool. You can create to-dos from jobs that fill your daily life and assign them to certain lists such as "Shopping", "Work", "Private" or anything else you would like. If you have any new tasks that spring to mind, just open Wunderlist and write them down.

You can even share your lists with colleagues, friends and partners. This will increase your productivity in every aspect of your life.

Wunderlist works on Windows PCs, Mac OS X, iOS devices (such as iPhone, iPod Touch and iPad, on Android Phones and Tablets, Windows Phone, Blackberry and Linux. There is also a web based version, available at their website.