YADrone comes in different flavors and which of these to choose depends on what you want to do:
[Github] This is the complete and most up to date source package. It's intended for developers only.
[Complete] If you want the complete source of a more or less stable release, choose this one.
[Android Only] This package contains an Android demo application.
[Jar Only] If you want to use YADrone as part of your own application, all you need is this library.
[All required libraries] This package not only contains the YADrone-jar, but all the other libs that are only required if you want to use graphical YADrone Control Center.