sk89q-command-framework is the command framework from sk89q's WorldEdit. It has been factored out so it may be used in other projects without having to include WorldEdit as a dependency.
You need to have Maven installed (http://maven.apache.org). Once installed, simply run:
mvn clean install
Maven will automatically download dependencies for you. Note: For that to work, be sure to add Maven to your "PATH".
Your submissions have to be licensed under the GNU General Public License v3.