joda time

http://www.joda.org/joda-time/

animal-sniffer

https://www.mojohaus.org/animal-sniffer/

Android-Universal-Image-Loader

https://github.com/nostra13/Android-Universal-Image-Loader

butterknife

http://jakewharton.github.io/butterknife/

Android runtime permissions powered by RxJava2

https://github.com/tbruyelle/RxPermissions

GestureViews

https://github.com/alexvasilkov/GestureViews

AltBeacon

https://github.com/AltBeacon/android-beacon-library