Joomla SEF and URL rewriting component.

sh404SEF creates Joomla SEF URL, and turn them to a more user-friendly format for your site visitors, as well as for search engines. It makes use of plugins to process the various components used in a site. Plugins for VirtueMart, MyBlog, Sobi2, Community Builder, iJoomla Magazine, iJoomla NewsPortal and more are included.

To build up on Joomla SEF URL, it comes with shCustomTags, a module to build and insert in your pages titles and meta tags, insert h1 or h2 tags where needed, and much more

Lastly, it is also a security components : it performs various checks to increase your site security against external attacks.