opensource social network software

" Pligg is an open source content management system available for download at no cost"

"Drupal.org is the official website of Drupal, an open source content management platform."

"NewsCloud is an open source media platform which you can use to launch your own grassroots media Web site. Or, you can get involved in the development of the NewsCloud platform"

"AROUNDMe is a GNU package. We use the General Public License (GPL) for our software meaning that you can copy our software, redistribute it, explore, change or modify the code."

"Dolphin Smart Community Builder is a universal, free, open source software that allows you to build any kind of online community."

"Even though PHPizabi is distributed unencrypted, it DOES NOT fall under any GPL license (Open Source does not necessarily mean OSD/GPL)."

"Elgg is an open source social networking platform developed for LAMP (Linux, Apache, MySQL, PHP) which encompasses weblogging, file storage, RSS aggregation, personal profiles, FOAF functionality and more."

"The software that powers Mugshot is 100% open source, including the client and the server."

" Web-based social bookmarking system. Allows multiple users to store, share and tag their favourite links online. License: GNU General Public License (GPL) "

"GetBoo just turned to open-source, under the GPL license at the end of April. I don't have any expectations, but I am confident it will add to my experience!"


-------------------

Dolphin

Dolphin, from Boonex, is a popular free community-building application that is being used for a number of dating sites. Many modifications have been developed, however many of them are only available for a fee. There is also a cost associated with removing the company’s links from your site.

PHPizabi

PHPizabi is another social networking script that charges a fee to remove their branding. They are rapidly approaching 100,000 downloads of their software, and have a few impressive-looking demo sites listed on their website.

Elgg

Elgg was developed with the educational industry in mind, but can be customized for any use. Many universities throughout the world have adapted the social software to fit their needs.

Mugshot

Developed by Red Hat, Mugshot allows you to post what you are reading and listening too, and share it with you friends. Mugshot is a little different, as both the client and server code are open source and available for download.

AroundMe

AroundMe is an open source social networking app that supports OpenID. They are based in Sweden. We haven’t seen many sites running on the platform.

---------------------
Top 40 Free Downloadable Open Source Social Networking Software
Vivalogo Resources

This is Vivalogo's list of best free, downloadable, open source social networking software (kinda hard to say all these words :) ).
Unlike some other lists you may find on the net, this one contains only really downloadable and functional software.
Note: listed in no particular order.
spree

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

iSocial is 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.
Mahara

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

This is a Social Network module for xoops CMS. You have seen Facebook, Orkut, Myspace , try Yogurt for Xoops!
VMukti

VMukti is a Unified Social Collaborative conferencing engine. Allows access through personalized, mashable web-interface. Core features:- Video conferencing, Audio conferencing, IP Telephony, Desktop sharing, Chat, Whiteboard, Presentation & More.
The PeopleAggregator

The PeopleAggregator is a next-generation social networking system that goes beyond the idea of social networks as mating games, and attempts to use open standards, network inter-connectivity and massive flexibility.
Appleseed

Appleseed is (augmented) social networking software, ie Friendster, only distributed. Sites running Appleseed will interoperate, and form the 'Appleseed Social Network.' Development is focused on privacy and security, as well as ease of configuration.
Mugshot Project

The Mugshot site lets you track what your friends are doing online across a variety of popular web sites ? music, photos, blog posts, and more.
GetBoo

Web 2.0 bookmarking system, both social (with tags) and private (with folders). Import and export your bookmarks from Firefox, IE, Mozilla, Netscape. Admin management section, translations, groups, bookmarklets, Firefox extension, RSS feeds, and more!
Akarru

Akarru is a social bookmarking engine, is used to build social bookmarkings sites, like www.blogmemes.com. Users posts links and promote links to front page using voting system.
Scuttle

Web-based social bookmarking system. Allows multiple users to store, share and tag their favourite links online.
SemanticScuttle

SemanticScuttle is a social bookmarking tool (based on Scuttle) experimenting new features as hierarchical tags, collaborative descriptions or OpenID authentification.
AROUNDMe

Create collaborative social websites (like Ning, Myspace, Yahoo or Google groups). Each group can create a multiple web pages. They get a drop in guestbook, blog, forum and wiki. Each group is fully customizable using xHTML, CSS, Javascript and PHP.
Clonesumating

Clonesumating is the open source version of the code that runs CONSUMATING.COM. It features many state of the art social networking functions including user profiles, user tagging, matching and discovery based on quirky tag combinations, group activities such as weekly photo contests and blog questions, an event calendar, RSS feeds for everything, etc. It is written primarily in mod_perl.
BeWelcome Rox

Get to know the global village and other cultures, share your place. BW Rox is the platform driving www.bewelcome.org and other social networks, aiming to bring people together in real life. Organize your travel or stay abroad, travelblog, meetings, ...
ICEcore

ICEcore open team collaboration software uses social networking to unify team workspaces w/ real-time web conferencing. Collaboration for knowledge networking, program management, communities-of-practice, telework, ...
Memephage

Memephage is an automated web log (blog). It passively gathers and summarizes links from various places. Currently: IRC, social MUDs, e-mail, and web browsers. Uses the POE multitasking and networking framework for Perl.
InteractOLE

A platform for the delivery and support of online learning. It differs from many other elearning platforms in that its aim is to concentrate on the social/interactive aspects of teaching and learning rather than the delivery of content to students.
Elgg

Elgg is an open source social networking platform developed for LAMP (Linux, Apache, MySQL, PHP) which encompasses weblogging, file storage, RSS aggregation, personal profiles, FOAF functionality and more.
CommunityNews

CommunityNews uses social bookmarking and bayesian techinques to provide periodic postings to blogs. Users can vote for or against RSS sources ti increase the chances that the source is used again. Spam filtering (bayesian) is provided by spam bayes.
OpenPNE

OpenPNE is a Social Networking Service Engine written in PHP. It has many features(friend control,friend invitation,diary,blog feeds,message box,etc).
MonkeyChow

Feed Aggregator Reader (branched from FeedOnFeeds) with Social Bookmarks (del.icio.us, Blogger, Newsvine, Technorati, mailto), Article Starring, Feed Tagging, OPML, Article Search, Reblogging and Refeeding, Aging, and Edit feed attributes.
NewsCloud

NewsCloud is an open source media platform for citizen journalism and the social news network hosted at NewsCloud.com.
Feed Me Links

Feed Me Links stores your bookmarks online so you can get to them anywhere. Import your favorites and share your links with friends. Add tags to organize your links. Discover new things.
WorldSpace

WorldSpace is a user-extensible shared virtual environment, aimed at being a next-generation social networking system.
Social Networking POC

A networking site on the lines of Orkut.Right now we plan to build it on Jboss seam and use a Java content management system like apache Jackrabbit as the backend. It would be more of a POC than an actual commercial app.
Zoints

Zoints is intimately aware that online communities are the most important aspect of the internet. Our free software solutions are designed to help solve the three major problems forum owners face: Member acquisition, Member retention and Profitability.
earth-life-simulation

A simulation of the world, there will be a global map representation and players can choose a country or civilization and develop it's social, political and military existence.
PHPizabi

PHPizabi is one of the most powerful social networking platforms on the planet. With literally thousands of websites powered by PHPizabi including everything from simple friends sites to the most complex networking super sites out there.
Ozcode

Ozcode is the source code behind Ozmozr.com, a microformat-aware RSS aggregator, social networking, resource sharing, identity aggregation and presentation site.
TallStreet

TallStreet.com is a new search engine concept where users make investments, with fictional money, in their favourite websites and the rankings are determined entirely by the users.
Jamss

Jamss is a social news site based off of Digg.com. Jamss allows for peer submission and review of web articles and can be adapted to fit a variety of themes. Jamss runs on PHP/MySQL.
Dolphin

Dolphin is open-source and free, although there is a cost associated with removing the company?s links from your site.
Ospo

Ospo is an opensource social portal project. It use standard function (add, remove friends, top10), forums integration, music module (artists directory with albums, songs), shoutcast integration, blog (add, delete, modify, view) and so on.
AstroSPACES

AstroSPACES is the world's first open source social networking solution. Coded from scratch, it is highly efficient and very easy to use.
FlightFeather

FlightFeather's goal is "social networking for everyone". This means that anyone should have a chance to run a popular social networking site -- on minimal hardware, and without wasting bandwidth.
SNOSS

Social Networking Open Source Software, an open source social networking framework, written in PHP, Javascript and MySQL with an AJAX UI.
OpenSocialNetwork

OpenSocialNetwork is a social network of open source. Its main task is to create a social network releasing the source code.
S3B

S3B - Social Semantic Search and Browsing - is a middleware that delivers a set of search and browsing components that can be used in J2EE web applications to deliver user-oriented features based on semantic descriptions and social networking.
Facelift

Facelift is a visualization and analysis software for online social networking services. It displays a given community as a node-link diagram and provides several search / filtering functions as well as cluster analysis features.