1. The free online tools at: http://www.freesitemapgenerator.com (makes Google sitemaps only).
2. The free tool at: http://www.xml-sitemaps.com (makes Google, Yahoo, and HTML-user sitemaps).
3. XML-Sitemaps also sells their online tool as an economical standalone tool ($15 US) which is very easy to use and highly configurable: http://www.xml-sitemaps.com/standalone-google-sitemap-generator.html (makes Google, Yahoo, and HTML-user sitemaps).
4. The NUAH tool, which is good but not quite as easy to use as the others, see: http://www.nuah.com/google-sitemap-generator (they also have a separate Yahoo sitemap tool).
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