MiniWiki is a small plugin for Ruby on Rails which adds a simple wiki to your project. It has saves the previous versions of the wiki pages, so you can easily revert back to an older version.
The source is hosted at github: https://github.com/tompesman/mini_wiki
./script/plugin install git://github.com/tompesman/mini_wiki.git
For now these are the installation steps to create a simple wiki in your Ruby on Rails app.