Nice list of many:
FREE - Server based app - It reads a text file, hyperlinks it and converts it to HTML on the fly.
MeshCMS simply helps you to edit pages, manage files and create some common components like menus, breadcrumbs, mail forms, image galleries and so on. There is no database, no content approval and no versioning. meshcms is 100% design flexible and is easy to retrofit old sites with it. It's a small set of simple but effective features. and it's intuitive, which IMO 95% of the cms system are NOT -billy gorman
CMS - free php/mysql based -
Powerful but WIN Only - $70-$230
Expensive - $30 per month - per person (WIN & UNIX (MAC))