Free extensions for Joomla!

Hello,

I would like to have a simple functionality to have all sitemaps as files, either automatically updated on the server, or save-able on my computer. Similar to how this site http://www.xml-sitemaps.com/ does it.

Sitemaps in many formats for all sorts of search engines, all with a couple of clicks. Would be great if xmap could do it, even manually.

Thanks!