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ActoGuitar - A guitar learning community that rewards members for contributing articles and videos.

Aozora Bunko - free digital Japanese books

Asian Open Source Centre * - contains an open content GFDL wiki on open source *

The Assayer - catalogs free-information books and accepts user-submitted reviews

Authorama Public Domain Books - XHTML+CSS public domain books with Wiki-style annotation system for unregistered users

BerliOS *

BioDirectory * - The Open Content Directory for Life Sciences and Medical Sciences Reseachers

Bitzi - free community-built catalog of digital files

Bruce Perens' Open Source Series * - Books about Linux and other Open Source software

California Open Source Textbook Project * - K-12 textbooks and other curriculum materials

Common Content * - open catalog of Creative Commons licensed content

The Connexions Project * - Rice University's course material

Creative Commons

Eldritch Press * - books

everystockphoto * - index of over 200,000 creative commons photos

ExtinctionLevelEvent.com - Open Content Web Comic *

Free Curricula Center - producing textbooks free for all to use, copy, and modify

Free high school science texts (http://www.nongnu.org/fhsst) is a project to create free science textbooks to help reduce textbook costs especially in 3rd world and developing countries

Freemages * A photo gallery high resolution photos under Free Licence (LAL www.artlibre.org).

Freematrix Web radio project - A long running experiment with open content and open source web radio technology.

FreeMedia * - stock photos from the University of North Texas

GrokDoc * - Usability study of GNU/Linux newbies

GNUtemberg * in Italian.

HomeworkManual.com * - A recently started project with goals to create a peer edited solutions manual encompassing all text books, available to everyone.

ibiblio *

indymedia - Independent Media Center

Jake * - Research software and database where content is built in an open source way

Libre Society * - open culture site

LibriVox * - volunteer-read public domain audio books

Linux documentation project * - Content project to develop documentation for Linux

LOCA Records * - open content record label

Magnatune * - open content record label

Mediaweapon * - open content for the practise of political transparency in revolutionary theory

Metavid * - open content archive of political proceedings and participant generated mediation of video meta data.

Mieliestronk * - open content with general, educational, comic and entertainment information in Afrikaans

MOAK47 * - open content for the production and reproduction of a collaborative, resistant culture.

Musopen * - Free, public domain music.

Narod sobe * - czech language free project Narod sobe - means Nation to itself

Nupedia * - peer-reviewed encyclopedia

Opart * - Open art pool

OpenArena * - Open Content for Quake 3

Open Clip Art Library * - the open clip art library.

Opencode * - consortium for open research and content

OpenContent * - open source licensing scheme for information content

Open Content for Education *

OpenContent Inititative - Open Content curriculum development project sponsored by a US public school district. Both standards, and curriculum content resources are editable.

Open Design * - Open Design products by designer Ronen Kadushin .

Open Directory Project * - web directory like Yahoo!.

Open-education.org * - Portal and advocacy-site for collaborative creation of Open Content Educational materials.

Open Gaming Center - an open content experiment to create a games and gaming encyclopedia

Open ICEcat - an open catalogue project to create a complete multilingual product catalogue

Openlaw * - Experiment in the open crafting of legal arguments

Open Music Registry * - Open sharing of music using an Open Audio License / site closed down

Open Photo * - stock photos

Open Publishing * - Open and public domain textbooks

Open-Songs - Free, Royalty Free MP3's / new link: Copacetix

Opsound * - Open sound pool, a record label.

OS Reviews * - Reviews of free and open source software

Open Content Orchid Directory

OYEZ * - US Supreme Court multimedia

Phd.jp - Science and Technology News

Pickings.de (daily news review)

Prelinger Archives * - government and advertising films

Project Gutenberg *

PlanetMath * - Math for the people, by the people.

Remix Commons - A network of free culture projects in the UK

Open-content rss channel directory

Sodipodi Clipart * - a large collection of flags of the world, and other clipart

Skwik - Free music download site is a place for beginning artists to get noticed.

SLOOP_Project - Free learning object site is a place for teachers interested in sharing learning objects.

SourceWatch * (formerly Disinfopedia)

Wikia - Click Here - a guide to everything, from travel to video games, to opensource projects

Wikimedia *

Wikimedia Commons *

Wikispecies *

Wikibooks *

Wikinews *

Wikipedia * - free encyclopedia

Wikisource *

Wikiquote *

Wiktionary *

Wikitravel * - travel guide (not part of Wikimedia)

Woochi - Wine Encyclopaedia

World66 * - An open content travel guide

World Lecture Hall * - Online course materials

The Worldwide Lexicon