Crabgrass is a software libary web application designed for social networking, group collaboration and network organizing. Our goal is to create communication tools that are tailored specifically to meet the needs of bottom up grassroots organizing...

BigBlueButton is an open source web conferencing system that enables universities and colleges to deliver a high-quality learning experience to remote students.

ConcourseConnect is a comprehensive, Open Source platform for rapidly deploying large online communities, bringing together online directory, social networking, and other tools. Built for high performance and scale.

Teambox is a project management platform created for real-world, real-time collaboration. Teambox uses a Twitter-style means of communication to send messages, update project status, and manage assigned tasks.

No SQL, just plain files to store data     * Security of files on Linux/Unix server     * Very fast access to required pattern file     * Images and thumbs caching     * Pages caching for faster response     * Animated images support     * Images Rating     * Images Archive     * Datewise Archive...

PeoplePods is an open source SOCIAL NETWORKING twitter clone toolkit built with PHP/MySQL for creating websites with social networking capabilities with ease. It can be used to build stand-alone sites or layered onto existing sites for adding social functionality.

OpenMicroBlogger is a oPEN SOURCE TWITTER CLONE. It’s different from Laconi.ca because it’s easier to install and it adds Movie/Photo/Song uploads (though the content does not broadcast to subscribers on other sites, just the notice itself and its original URL)

NetworX is a social media and networking technology open source platform for businesses and organizations. Using NetworX companies can easily create online communities and corporate marketing initiatives to drive customer loyalty and increase customer experience.

Eventicus is a social event community

Sharetronix Opensource is a multimedia microblogging platform. It helps people in a community, company, or group to exchange short messages over the Web. Very similar to Twitter, users can easily connect with each other with open or private threads.

I. Create your activity stream
    * Post new Jaikus
    * Add icons
    * Customize your background
    * Add your Web feeds
    * Set your location
    * Put a Jaiku badge on your blog

P2 is a theme for WordPress that transforms a mild-mannered blog into a super-blog with features like inline comments on the homepage, a posting form right on the homepage, inline editing of posts and comments, real-time updates so new posts and comments come in without reloading, and much more.