3things is a simple to-do website that helps you get things done. Unlike other similar services, 3things is extremely plain and simple. Head to the website and you’ll be invited by a to-fill list right away. You can note down three of the most important things you’d like to do and set up a monthly reminder for the same. There is a space to type in your email address and you’ll be notified accordingly. Once you have completed one or more of the three things, you can add other things you’d like to accomplish. Not to mention, this to-do and reminder service is ideal for people who have a hard time keeping up with things.