PB Wiki http://pbwiki.com
A wiki is software that allows users to create, edit, and link web pages easily. Wikis are often used to create collaborative websites and to power community websites. These wiki websites are often also referred to as wikis; for example, Wikipedia is one of the best known wikis.
Wiki Wiki is a reduplication of wiki, a Hawaiian word for "fast". In English, "wiki" is an abbreviation of it. However, since its application to consumer generated media, some have suggested that wiki means What I Know Is; this seems to be just a pure backronym.