For now only the eclipse plugin is available as download (see below) the rest is only available by checking it out from sourceforge's subversion repository. It contains one project for the library, including an html report generator, an ant task and a swing program that allows you to move classes around to see if this solves your dependency problems.
The eclipse plugin can be used to get warnings on all lines where you violate the dependencies defined in /jlayercheck.xml (in the project root). You have to put the configuration file there and activate the builder by right clicking on the project in the package explorer and clicking on "Add/Remove JLayerCheck Nature". Afterwards the "JLayerCheck Builder" should occur in the builders section of your project.
The name of the eclipse update site to install the plugin is: