Animation http://facebook.github.io/rebound/ Downloading & Caching http://square.github.io/picasso/ Binding http://jakewharton.github.io/butterknife/ Logging Call logging https://github.com/JakeWharton/hugo Tree logging Timber - https://github.com/JakeWharton/timber Viewer Viewer - https://github.com/JakeWharton/pidcat/