Google Now is one app to help you stay organised. The app organises just about everything you can think of and around the clock. 24me is another app that can give you 24-7 assistance. It even syncs with other apps like Facebook to send messages to your friends on their birthday in case it slipped your mind. Check out Quip as well. If Mark Zuckerberg uses it, then you should too. Last but not least, try something simple like Wunderlist.