Follow the instructions here.
Simply unzip the distribution that was generated by the build. Run the executable at bin/ddf.bat or bin/ddf.
The Documentation page has complete documentation for DDF, available in html or pdf format.
Please go here for information on becoming a contributor.
This is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. A copy of the GNU Lesser General Public License is distributed along with this program and can be found at http://www.gnu.org/licenses/lgpl.html.