Todoist is a productivity boosting to-do list app that has number of features to make your life much easier than before. Set smart time notifications, add sub tast, add priority, add tags are a few to name. But the free version doesn't allow notification and you have to check the app every time to know what you have to do. Which kind of beats the purpose of a to-do list app because you make a list so you won't forget. If you are not going to update you will possibly forget most of the time.
It's fully cloud based, and has 15+ plugins available - so you can use it on Windows, Mac, Android, iPhone, GMail, Outlook etc etc. Unlike most task managers, Todoist can even send you email or SMS alerts (which you configure) to ensure you never miss anything.
Here's what you have to do to get the Todoist Premium trial for 4 months.
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At this point, you now should have 4 months of Premium for free