Free extensions for Joomla!

I am having a problem with Xmap not working with Joomla 2.5. I install Xmap 2.21 and the XML is empty...(Number of URLs in this Sitemap: 0). It might be worth noting that I am using sh404SEF and wondering if this is the problem. I would really like to use Xmap as I have used it on other websites and it worked great. Has anyone tired JCrawler, if I can't get Xmap to work I was thing about trying this.

Any help would be great

Steve