Airdroid is a unique and useful application that lets you transfer files, send SMS messages and control your phone through your PC. It is available within the Google Play store and the iOS App Store and provides a useful alternative if you need to grab a file but don’t have a USB cable at hand. While Windows has a full rich client that allows easy access to the features, those of us on Linux have to use the web-based interface, but this doesn’t make the application any less useful.