What are some alternatives?
When comparing XmlSitemapGenerator.org 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.
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.
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.
Feedly - The content you need to accelerate your research, marketing, and sales.