This is some software that's implementing or will implement federated social web technology.
Also see
Ampify is an open source, decentralized, social platform. We are working towards an initial release for the end of this year which will provide you with a web application framework to create social apps on top of a secure, decentralized core.
Appleseed is an open source, fully distributed and decentralized social networking software.
Batucada is the new name for the software that will power the Drumbeat website. Batucada will use Open Web technologies to build a decentralized social application that connects Drumbeat users with projects and local events. As an Open Source project, we are actively inviting people to get involved.
BuddyCloud is built for people who care about their privacy.
BuddyPress - Social networking in a box. Build a social network for your company, school, sports team or niche community all based on the power and flexibility of WordPress.
Crabgrass is a free software web application designed for social networking, group collaboration and network organizing.
Diaspora is a forthcoming open-source personal web system intended to be part of a distributed, decentralized social networking architecture.
DiSo (dee • soh) is an initiative to facilitate the creation of open, non-proprietary and interoperable building blocks for the decentralized social web.
Drupal is an open source content management platform powering millions of websites and applications. It’s built, used, and supported by an active and diverse community of people around the world.
DSNP reference implementation comes in two parts. The DSNPd daemon handles identity, authentication, encryption, verification, and message distribution. This component is reusable by other projects that wish to communicate over DSNP. The content manager is called Choice Social. It is a PHP application that the user accesses in the usual browser-based way to manage and view content. It communicates with the DSNP daemon using a socket.
Duuit! was created in July 2009 as a better way to socialize and stay connected on the internet.
The Lorea Framework enhances Elgg with privacy, encryption, group cooperation and network federation functionality. The federation functionality is currently restricted to seed (node) administrators, but covers most of the specs.
Friend2Friend servers provide a set of XML process virtual machines, (soft-systems), which are virtual platforms on which to run 'guest' scripts such as those received in messages). They are not typical VMs, since they manage their own data, and are intended to persist and interact with one another over a network. F2F has a runtime-system to interpret its scripting language (XML) as F2F script - i.e. according to the servicereq processing model.
Friendika is decentralized, open source, secure, private, modular, extensible, and federated.
GNU social is free software that runs decentralized social networks.
Jappix is a fresh new open social platform which enables you to create your own cloud, wherever you want to. People must be able to get in touch with all their friends on a free decentralized network!
Joomla is a free, open-source content management system (CMS) and application framework that powers 2.7% of the entire web. With a vibrant volunteer community, user-friendly features and plenty of power.
Kopal is a set of standards that let you be a part of web-wide social network using your very own URI as your identity. Kopal is decentralized and distributed and no single authority controls the network. Best of all it is an open standard, for any one to hack in.
NoseRub wants to be an inspiration, protocol and implementation of a decentralized social network.
OneSocialWeb is a free and open decentralized social networking platform, based on XMPP, and developed by the Vodafone R&D group.
OpenLink Data Spaces (ODS) is an industry standards-compliant data space platform that includes a broad collection of distributed collaborative applications covering: blogs, wikis, shared bookmarks, file management, calendaring, email, photo galleries, discussion forums, polls, [more].
Every item of data within an ODS instance is endowed with a de-referenceable URI. This enables any HTTP-compatible client to obtain a negotiated representation of the description of any ODS data item.
ODS currently interoperates with several other social web platforms including Facebook, and is intended to interconnect with any and all.
SMOB is a Semantic MicroBlogging framework that enables an open, distributed and semantic microblogging experience based on state-of-the-art Semantic Web and Linked Data technologies.
It relies on distributed hubs that communicate each other to exchange microblog posts and subscriptions (i.e. following / followers). Anyone can install his own hub and start following other users, while SMOB also allows cross-posting on other platforms such as Twitter.
SocialRiver is OStatus-based software that works with WordPress and BuddyPress to create a decentralized federated social networking platform.
Social Igniter draws inspiration from the ease of setup & extensibility of WordPress, the addictive nature of Facebook and the freedom of open source projects like Diaspora.
StatusNet's Open Source social software enables organizations to collaborate, share insights and build relationships in real time.
versionvega is a peer-to-peer general purpose network for applications far beyond file sharing, based on a peer-to-peer library called FreePastry.