Best way to describe it, I guess Wiki on steroids for cataloging open source projects. Here’s what the AJAX tag page looks like:
http://www.swik.net/tag/ajax

Swik project pages are different from the typical wiki pages you may have seen before. Each project page has a bunch of topics: anyone can add or edit topics, or add or edit entries in topics.

For example, you might add a new topic ‘Interesting Links’ under a Documentation topic, or edit an existing entry to correct or expand it.

Search for any Open Source Project, Swik can automatically find information for it. Or you can link to http://swik.net/project/yourProjectName and the project will automatically be created.

And anyone can add new sections to each page, and the contents is available under the Creative Commons Attribution-ShareAlike license. Pretty cool.

Link