No idea where to start? Check the getting started guide!
How to add as Maven dependency? Take a look at this.
This library usually supports the latest ev3dev kernel, unless a "breaking changes" kernel is released. This library is tested to run with ev3dev kernel version 20.
v4.4.61-20-ev3dev-rpifor Raspberry Pi 0/1
v4.4.61-20-ev3dev-rpi2for Raspberry Pi 2/3
This library support most of the motors and EV3-G sensors. Extra bindings are still in development, for details check here.
tl;dr This project is licensed under the MIT License, whereas any other applications/libraries copy or base their code on this is a kind of "modified" work.