WakkaWiki (often shortened as Wakka) is a very small wiki engine written in PHP, that is easy to install, hack and maintain. It was originally developed by Hendrik Mans (creator of the PlanetCrap discussion community) with help from Carlo Zottmann.
As of September 29, 2004, its website was down and the project stopped, although a large community of contributors was still actively posting bugfixes, extensions and new functionality. Lacking further maintenance, Wakka ceased being attractive to new users and saw most of its contributors migrate to one of its many forks.
Today, WakkaWiki survives in a number of forks, sharing the same ancestry but pursuing their own visions.
The focus of WakkaWiki was having a simple and expandable structure. It lacked some features, but thanks to its simple design there are various forks and variants available, such as WackoWiki and WikkaWiki or several others.
WakkaWiki spawned at least five forks: