Are you continually distracted by your mobile phone? Do constant social media and messaging updates keep you from really getting stuck into your work? Try Forest, an app that rewards you for leaving your phone alone by growing a big beautiful tree from a tiny sapling. If you give in and use your phone before the phone-free time you set yourself at the beginning, you have to watch your little digital tree die. Perhaps a tad dramatic but it is certainly an incentive, and the tree you kill is only a digital image. No actual trees are harmed by running this app, not at least so far as we are aware.