What are some alternatives?
When comparing MySitemapGenerator and XML-Sitemaps.com, you can also consider the following products
FreshRSS - FreshRSS is a free, self-hosted RSS aggregator.
DYNO Mapper - Create Sitemaps with the DYNO Mapper Visual Sitemap Generator.
XmlSitemapGenerator.org - Easily create HTML, RSS and XML Sitemaps online for free.
GlooMaps - Create your visual sitemap on the go - easy peasy
Web-Site-Map.com - XML Sitemap Generator - Free online XML / Google Sitemap Generator. Easy to use, no need to sign-up. Good for big sites.
WonderWebWare Sitemap Generator - Sitemap Generator is freeware program that will help you to automatically generate site maps for google, bing and yahoo in their respective file formats.