What are some alternatives?
When comparing DYNO Mapper and A1 Sitemap Generator, you can also consider the following products
XML-Sitemaps.com - Free Online Google Sitemap Generator.
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.
GlooMaps - Create your visual sitemap on the go - easy peasy
FlowMapp - UX planning tool for creating a visual sitemap
Screaming Frog SEO Spider - The Screaming Frog SEO Spider is a small desktop program (PC or Mac) which crawls websites’ links...
XmlSitemapGenerator.org - Easily create HTML, RSS and XML Sitemaps online for free.