Package management support is provided by Maven, which is open source software.
The original software is available from: http://maven.apache.org/
This software is available under an Apache License v2.0: http://maven.apache.org/license.html
Unit test support is provided by the JUnit library, which is open source software.
The original software is available from: http://www.junit.org/
This library is available under a Common Public License v1.0: http://www.junit.org/license
The API to access Git from Java is provided by JGit, which is open source software.
The original software is available from: https://github.com/eclipse/jgit
This library is available under Eclipse Distribution License v1.0: https://github.com/eclipse/jgit/blob/master/LICENSE