Large wiki about knowledge management with many resources.

Login based site covering a variety of topics as chosen by its users.

A wiki-like site that allows anyone to post new information, with page ownership and editors to keep things organized and tons of PC and embedded controller engineering information.

Central staging point for the "Tour Bus" system of routes between similarly-themed wikis.

The possibly canonical list of public wikis, on the original wiki.

A wiki dedicated to books; an online discussion where the primary topic is books read by the people who contribute.

The biggest multilingual open access encyclopedia on the internet. Over 500,000 articles and still growing.

The official wiki web for AOLserver, America Online's open-source web server.

A database of crazy software- and hardware-projects of geeks all around the world with way too much spare time on their hands.

A project geared to provide peer created How-Tos, tips, and documentation to users of the Wine application.

For discussion of communities, both online and in the real world, including management, teaching and conflict mediation.

A collaborative writing project to build the world's largest how-to manual.