Debatepoint is not only open-source, but also open-content. Its source-code is open to the public for review, and its content is open for redistribution via the GFDL (like wikipedia). If you wanted to make a complete and exact clone of debatepoint, you can. Not only is truthmapping.com not open-source nor open-content, at the bottom of its about page states "The TruthMapping method is patent pending."