Guiki is my attempt to scratch my own itch for a simple content management system. It is very easy to install and use and does not have a lot of the fluff other wiki systems and content management systems include.
FEATURES:

    * Open Source ( Free GPL Code )
    * Very simple
    * Easy to create websites for normal people
    * Easy to add content
    * Great for intranets / documentation of company functions
    * Search function

Get it at github.com/lankford/guiki