What are some alternatives?
When comparing DYNO Mapper and Netpeak Spider, you can also consider the following products
XML-Sitemaps.com - Free Online Google Sitemap Generator.
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
A1 Sitemap Generator - A1 Sitemap Generator has been in active development and sold since 2005.
SEOmator - SEO website analysis & audit tool
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.
Screaming Frog - Screaming Frog is search engine marketing agency offering search engine optimisation and pay-per-click advertising services.