Pligg is an open source CMS (Content Management System) which provides social publishing software that encourages visitors to register on your website so that they can submit content and connect with other users. Our software creates websites where stories are created and voted on by members, not website editors. It is a user driven CMS that relies on independent authors content and participation to manage news articles. It has support for Groups, Private messaging, User profile management, SEO support, RSS feeds and lot more. It is a CMS with social publishing feature.

Pligg is an open source CMS (Content Management System) which provides social publishing software that encourages visitors to register on your website so that they can submit content and connect with other users. Our software creates websites where stories are created and voted on by members, not website editors. It is a user driven CMS that relies on independent authors content and participation to manage news articles.

Pligg - Social Publishing CMS

HumHub is a feature rich and highly flexible OpenSource Social Network Kit written in PHP. It provides support to build Social Intranets, Enterprise Social Networks, Private Social Networks. Its social features include Commenting, Like, Following, Mentioning, Tags, OEmbed Support. The communication in HumHub works with spaces. A space can literally be anything, a project, a group or just a simple topic. For every space you can invite multiple users and make up your own access rights and rules.

HumHub - Open Source Social Network

StatusNet is a microblogging platform. It helps people in a community, company, or group to exchange short (140 character) messages over the Web. Users can choose which people to “follow” and receive only their friends' or colleagues' status messages. It provides a similar service to sites like Twitter or Yammer.

Statusnet - Microblogging platform powers Identi.ca

GNU social is a free social networking
platform and it is a continuation of the StatusNet project. It helps people in a community, company or group to exchange short status updates, do polls, announce events, or other social activities (and you can add more!). Users can choose which people to "follow" and receive only their friends' or colleagues' status messages. It provides a similar service to proprietary social network sites, but is much more awesome.
 
With a little work, status messages can be sent to
mobile phones, instant messenger programs (using
XMPP), and specially-designed desktop clients that
support the Twitter API.

GNU social is a free social networking
platform and it is a continuation of the StatusNet project. It helps people in a community, company or group to exchange short status updates, do polls, announce events, or other social activities (and you can add more!). Users can choose which people to "follow" and receive only their friends' or colleagues' status messages. It provides a similar service to proprietary social network sites, but is much more awesome.

GNU Social - Microblogging, Alternative to Twitter

A powerful open source social networking platform. It provides the components you need to build a fully-featured social environment, including 
 <UL>
	<LI>Profiles</LI>
	<LI>Social bookmarking</LI>
	<LI>Groups</LI>
	<LI>Activity Streams</LI>
	<LI>Access controls</LI>
	<LI>Blogging / Microblogging</LI>
	<LI>Web Services API</LI>
	<LI>Pages</LI>
	<LI>RSS / JSON</LI>
	<LI>Widgets</LI>
	<LI>Video</LI>
	<LI>Documents</LI>
	<LI>Photo Gallery</LI>
 </UL>

A powerful open source social networking platform. It provides the components you need to build a fully-featured social environment, including Profiles, Groups, Activity Streams, Access controls, Blogging / Microblogging, Web Services API etc.

Elgg

Hotaru CMS is a PHP platform for building your own websites. The most common use for Hotaru is social bookmarking. It has all the plugins you need to make your own Digg-style community. It is a framework for making websites customized to your needs. It has support of User and group management. Users could login from Twitter, Facebook, Yahoo and Google. It does have API support for developers. The CMS functionality could be extended via plugins. Its main purpose is of Social Bookmarking, where Users can share URLs with others. Users could add tag, increase or decrease the vote, add comment etc. It has Anti Spam support.

Hotaru CMS is a PHP platform for building your own websites. The most common use for Hotaru is social bookmarking. It has all the plugins you need to make your own Digg-style community. It is a framework for making websites customized to your needs.

Hotaru CMS - Plugin Powered PHP based CMS Engine

BuddyPress provides social networking features to a WordPress. It works well to enable people with similar interests to connect and communicate. It supports Content tagging, Grouping of similar activity stream items, AJAX live updating of site wide activity stream, Message archive, Better XProfile management and lot more. 

Buddypress - Social Networking features in WordPress

Voten.co is a real-time social bookmarking for the 21st century. It's real-time, beautiful, customizable yet simple. 

Voten - The code that powers voten.co

Friendica is a communications platform for integrated social communications utilising decentralised communications and linkage to several indie social projects as well as popular mainstream providers. It provides fully distributed communications protocols ("DFRN" and "Zot!") for securely sharing with your friends across the internet.

Friendica - Facebook alternative

PixelFed is a federated social image sharing platform, similar to Instagram. Federation is done using the ActivityPub protocol, which is used by Mastodon, PeerTube, Pleroma, and more. Through ActivityPub PixelFed can share and interact with these platforms, as well as other instances of PixelFed.

Pixelfed - Federated Image Sharing (WIP) 

Postmill is a free, web-based, social link aggregator with voting and threaded comments. It is built on the Symfony framework. Any similarities between this software and that of a large community symbolised by an alien logo are purely coincidental.

Postmill - Social link aggregator with voting and nested comments

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

Scuttle - Social Bookmarking System

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