sabros.us is a CMS to put your bookmarks online with folksonomy support; just like del.icio.us, but the big diference is you will have the complete control of the source code.
Pligg is Web 2.0 Content Management System (CMS) unlike any other existing CMS. Pligg's Web 2.0 user interface gives your visitors a reason to come back to your site by making them decide on the site's content and giving them the chance to social network.