Free Social Networking
Kootali helps you build social networking site similar to Facebook.
More Info 
Developer: katichsm
License: Freeware
Operating System: Linux
Social networking script concept is like as social news sites digg and reddit, user can suggest an interesting url/article to the upcoming news that other members can read and vote.
Developer: Truworth
License: BSD License
Operating System: Windows,Linux
AstroSPACES is the first ever free, open source social networking solution.
Developer: osspaces.googlecode.com
License: Artistic License, GNU General Public License (GPL)
Operating System: Windows, Linux, BSD, Solaris
Social networking script concept is like as social news sites digg and reddit, user can suggest an interesting url/article to the upcoming news that other members can read and vote.
Developer: Truworth
License: BSD License
Operating System: Windows,Linux
iSocial is a next generation social networking software aimed at businesses and enterprises, but can still be used like a traditional social network.
Developer: Swatson
License: GNU General Public License (GPL)
Operating System: Linux, MYSQL
The administrator can select which social networking services are available and the form in which the profile is promoted (graphical or textual).
Developer: wordpress.org
License: Artistic License, GNU General Public License (GPL)
Operating System: Windows, Linux, Mac OS, BSD, Solaris
A big number of social networking services are supported.
Developer: wordpress.org
License: Artistic License, GNU General Public License (GPL)
Operating System: Windows, Linux, Mac OS, BSD, Solaris
Customizable, user friendly open source social networking portal software with features like blog, forum, chat, gift shop,job poratl,point system etc.
Developer: iScripts
License: Open Software License
Operating System: Linux,Windows
PHP-Spacester is a social networking script such as Myspace and friendster.
Developer: SourceForge.net
License: Freeware
Operating System: All
MyOwnSpace is a clone of social networking software similar to Myspace.
Developer: SourceForge.net
License: Freeware
Operating System: All
FlightFeather's goal is "social networking for everyone".
Developer: Flightfeather
License: Freeware
Operating System: BSD; Linux
entity-based social networking engine.
Developer: Entity-basedsoc
License: Freeware
Operating System: All
Beatz is free opensource online social networking software that allows you to start your own music community just like Pure Volume and RBS is a free to use unique bidding system, developed by Cogzidel Technologies.
Developer: Balakrishnan
License: GNU General Public License (GPL)
Operating System: Linux
A prominent creator of social networking software, we package everything into a powerful PHP social networking software.
Developer: Johnny Lim
License: Common Public License
Operating System: Linux
IntelliFolks is a free Enterprise Social Networking Server.
Developer: download.adenin.com
License: Freeware
Operating System: All
NetworX is social networking software that allows you to create your own private community for anything that interest you.
Developer: Mike
License: GNU General Public License (GPL)
Operating System: PHP/mysql compatible
PHP Social Flies is a social networking script written in PHP and uses 1 mysql database.
Developer: zWebmaster.com
License: Freeware
Operating System: linux,windows
i-Net Online Community site script is an online social networking software that allows you to start your own site just like Myspace, Hi5 and Facebook.
Developer: i-net solution
License: Common Public License
Operating System: Not Available
Multiple social networking accounts (delicious, facebook, mybloglog, etc.
Developer: wordpress.org
License: Artistic License, GNU General Public License (GPL)
Operating System: Windows, Linux, Mac OS, BSD, Solaris
Box Social is a piece of Open Source Social Networking software written in c# for the Microsoft.
Developer: boxsocial.net
License: Freeware
Operating System: All