DAViCal is a server for calendar sharing. It is an implementation of the CalDAV protocol which is designed for storing calendaring resources (in iCalendar format) on a remote shared server.

The Darwin Calendar Server is a standards-compliant server that allows multiple users to collaboratively share calendaring information. It provides a shared location on the network to store schedules, and allows users to send each other and manage invitations.

Crabgrass is a software libre 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. By social networking, we mean the ability of users to get to know one another through their online contributions and presence. By group collaboration, we mean the ability of small groups to get things done, such as share files, track tasks and projects, make decisions and build repositories of shared knowledge. By network organizing, we mean the ability of multiple groups to work together on projects in a democratic manner.

Rudel is a collaborative editing environment for GNU Emacs. It supports multiple backends to enable communication with other collaborative editors using different protocols (most notably Gobby).

The CNMAT Resource Library is our fast growing collection of materials, sensors, gestural controllers, interface devices, tools, demos, prototypes and products - all organized and annotated to support the design of physical interaction systems, "new lutherie" and art installations.

A networked book for network art. Networked proposes that a history or critique of interactive and/or participatory art must itself be interactive and/or participatory; that the technologies used to create a work suggest new forms a “text” might take. We invite you to participate. You can comment on an entire chapter, but the CommentPress plugin also allows you to comment on individual paragraphs. You are also welcome to translate the chapters into other languages.

Open Source web based project management and collaboration framework

The Atlas Obscura is a collaborative project with the goal of cataloging all of the singular, eccentric, bizarre, fantastical, and strange out-of-the-way places that get left out of traditional travel guidebooks and are ignored by the average tourist. If you're looking for miniature cities, glass flowers, books bound in human skin, gigantic flaming holes in the ground, phallological museums, bone churches, balancing pagodas, or homes built entirely out of paper, the Atlas Obscura is where you'll find them.

DIYbio is an organization that aims to help make biology a worthwhile pursuit for citizen scientists, amateur biologists, and DIY biological engineers who value openness and safety.

Science Commons designs strategies and tools for faster, more efficient web-enabled scientific research. We identify unnecessary barriers to research, craft policy guidelines and legal agreements to lower those barriers, and develop technology to make research, data and materials easier to find and use.