The following open source social networking softwares are freely downloadble:

1. spree - an expert search engine where users ask questions to find other participating users, who are knowledgeable in that area and willing to help.

2. iSocial - a free social networking CMS software that allows you to create your own Friendster and Orkut like sites. Use bookmarks,
   dating and create groups with just one mouse click.

3. Mahara - Mahara is fully featured electronic portfolio, weblog, resume builder, and social networking system for connecting users and creating online communities.

4. Yogurt - a Social Network module for xoops CMS. You have seen Facebook, Orkut, Myspace , try Yogurt for Xoops!

5. VMukti -