Until a comprensive zip or tarball is made, the components need to be downloaded separately. Source code can be downloaded from the Sourceforge Download page. The provided zip files are intended to work with Eclipse 3.1 to Eclipse 3.3.
The FactoryGen package creates classes implementing the Factory pattern. The superclass of the generated factory and the interface required for the built classes is provided in the jcommons-factorygen-0.4-lib.jar. This jar file is provided under the GNU LGPL, so that the generated factories can be used in non-GPL code or proprietary code. In order to build factories, you will need the jcommons-factorygen-0.4-builder.jar.
The other files are provided under the GNU GPL.