What are some alternatives?
When comparing GlooMaps and MySitemapGenerator, you can also consider the following products
DYNO Mapper - Create Sitemaps with the DYNO Mapper Visual Sitemap Generator.
FreshRSS - FreshRSS is a free, self-hosted RSS aggregator.
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.
XmlSitemapGenerator.org - Easily create HTML, RSS and XML Sitemaps online for free.
XML-Sitemaps.com - Free Online Google Sitemap Generator.
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.