“Say ‘goodbye’ to Disqusting third-party comments with HashOver, a free and open source PHP comment system under the GNU Affero General Public License. HashOver adds a “comment section” to any website, by placing a few simple lines of JavaScript or PHP to the source code of any webpage. HashOver is a self-hosted system and allows completely anonymous comments to be posted, the only required information is the comment itself.”
“HashOver addresses the fundamental problems with many third-party comment systems, like Disqus, IntenseDebate, Livefyre, Facebook Comments and Google+ Comments.”