Wunderlist is an attractive to-do list service that is accessible both via the web and through mobile apps. It allows you to add tasks that you need to get done, an optional due date and optional reminders. Reminders can be sent via email or desktop notifications on Firefox and Chrome. Mobile phone users can also get task reminders via push notifications.
Tasks can be categorized using lists and completed tasks can be hidden or made visible. Wunderlist is easy to use and is free with a Pro version available for more collaborative features and to allow file’s to be uploaded with to-do tasks.