Joomla
Joomla also provides a free open source system that has a following of experts to assist you in successfully launching a website.
System details include features such as page caching to improve performance, RSS feeds, printable versions of pages, news flashes, blogs, polls, website searching, and language internationalization. Joomla is licensed under the GPL, and is the result of a fork of Mambo.
Joomla is a content management system also, yet it goes one step upward and beyond a simple CMS package.
At joomla.org the application is defined as “A content management system is software that keeps track of every piece of content on your Web site, much like your local public library keeps track of books and stores them.”
Joomla actually begun as Mambo. You can read its history if you are interested in how Joomla came into being.
Joomla is designed for very easy install. You do not have to be knowledgeable about HTML, XML or other programming languages
Many Web hosting services offer a single-click install, getting your new site up and running in just a few minutes.
Since Joomla is so easy to use, as a Web designer or developer, you can quickly build sites for your clients.
If you wish to transfer maintenance over to clients, with minimal instruction, you can empower your clients to easily manage their own sites themselves.
If your clients need specialized functionality, Joomla is highly extensible and thousands of extensions (most for free under the GPL license) are available in the Joomla Extensions Directory.