Joomla is a powerful Content Management System (CMS) tool like WordPress and it is also very popular. We know WordPress for blogging, with Joomla we can do blogging and other things also, we can create dynamic websites for small business owners. It also has a very strong community support, it is also completely free and Open Source because open source matters. It seem little tough than WordPress but when you start working on it will be easy.
Here is the resources list of free Joomla templates download.