Pilgg : Pligg was created as a social networking CMS. While most content management systems are designed for only a handful of authors, Pligg CMS was designed to manage a site with an unlimited number of authors. All of these registered users are in control of the website’s content. It is a user driven CMS that relies on independent authors’ content and participation to manage news articles.
Mxxt : Mixxt is a intelligently designed open source platform that helps you build your very own social network at rapid development speeds. Develop, manage, and run your own community with ease and the help of forums, wikis, a custom design, the addition of photos, and a private network that’s dedicated to your community. You’ll also be able to work alongside other members to build and grow your community.
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 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 is fully featured electronic portfolio, weblog, resume builder, and social networking system for connecting users and creating online communities.
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 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.
Mugshot was a social networking website created by Red Hat. Unlike most other social networking websites (which are concerned with advertising), it offered a desktop client and web widgets. Mugshot was meant to facilitate real-world interactions with friends, and make one's normal computer use more social. It provided the functionality of a social network aggregator.
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!
Web-based social bookmarking system. Allows multiple users to store, share and tag their favourite links online.
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.
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 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, ...
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.
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.
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.
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.
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.
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.
Anahita Social Engine - Anahita is a scalable social networking platform that is built as Joomla extensions using the Nooku framework.
Community Engine - Community Engine is an open source plugin for Ruby on Rails applications that provides the common features of social networking applications
Oxwall -Oxwall is unbelievably flexible and easy to use PHP/MySQL community software platform.