iTunes link: reQall – Free
These days we all live busy lives and sometimes it can be easy to forget appointments, meetings or just random stuff you need to do at certain times. reQall lends a helping hand by not only allowing you to make to-do lists, but also by reminding you when you need to action stuff in your lists.
You can add notes either by voice or text and the service can even convert your voice memos into text. Its neatest feature is the way it automatically recognises dates, times and other keywords to make it easier for you to organise your various tasks. The paid for service also has location awareness, so you check what tasks you need to catch up on in any given location.
reQall is a great app for providing timely reminders about important stuff you need to do.