CoRank is the first service on the net where you can create a site about any topic you like so that: Whenever you find something interesting on the net about that topic (an article, photo, and video) you could add it and save it; Other people also interested in that topic can, if you allow it, submit to your site their own discoveries about that topic; and We all can post comments, vote whether we liked each submitted item.
License Free
Operating System Webware