The Portland Pattern Repository and others

The oldest public wiki features links to wiki software packages.
This site is a wiki whose primary focus is PeopleProjectsAndPatterns in SoftwareDevelopment.

Note that the idea of 'Wiki' may seem strange at first, but dive in and explore its links. Wiki is a composition system; it is a discussion medium; it is a repository; it is a mail system; it is a tool for collaboration. In fact we don't know quite what it is, but it's a fun way of communicating asynchronously across the network.

Meatball Wiki
Meatball Wiki aspires to be a community of communities: an intercommunity or metacommunity. It deals with online culture, especially how people online come together naturally in groups. Along with that, some of us also like to talk about building our own communities.

If in doubt look here in WhyWikiWorks. (Also under Meatball Wiki)
Or in here WikiDisadvantages. -