I can't actually post url's just yet but I highly recommend looking at googles list of sitemap generators
Enter "Sitemap Generators A collection of links to tools and code snippets that generate Sitemap files" into google, and click on the first link, which should be on the code[dot]google[dot]com site.

There's free and commercial ones that can be used on and offline. I'd be inclined to use server-side.