Sugar ORM
http://satyan.github.io/sugar/
MPAndroidChart
https://github.com/PhilJay/MPAndroidChart
Material File Picker
https://github.com/nbsp-team/MaterialFilePicker
Timber
https://github.com/JakeWharton/timber
Color Picker
https://github.com/QuadFlask/colorpicker
Better Pickers
https://github.com/code-troopers/android-betterpickers