What are some alternatives?
When comparing GlooMaps and VisualSitemaps, you can also consider the following products
DYNO Mapper - Create Sitemaps with the DYNO Mapper Visual Sitemap Generator.
Sitemod - Modify any website in real-time. Share it with the world.
XML-Sitemaps.com - Free Online Google Sitemap Generator.
FlowMapp - UX planning tool for creating a visual sitemap
A1 Sitemap Generator - A1 Sitemap Generator has been in active development and sold since 2005.
MockFlow SiteMap - Create beautiful sitemaps & UI flow