Here's a little list I made. Rep points are appreciated, but first take a look at the list Pligg - just a digg clone, a good one. http://www.pligg.com/ Scuttle - more similar to Reddit than Digg, still in development, but working nicely. http://scuttle.org/ Akarru - Akarru is a social bookmarking engine, is used to build social bookmarkings sites, like www.blogmemes.com. http://sourceforge.net/projects/akarru laicos - or social backwards is a social bookmarking website development application. Use this project to create a Digg style clone. In asp.net and MySQL environment. http://sourceforge.net/projects/laicos wiklink - allows users to share their bookmarks online. Like wiki, anyone can freely edit links. http://sourceforge.net/projects/wiklink Different stuff; vLink - vLink is a single user online bookmark management system. Think of it as del.icio.us or scuttle for single user, private, use.Features include tag clouds, screen shot previews, live search suggestions, fetches link infos from del.ico.us... http://sourceforge.net/projects/vlink/ Hope someone finds it useful