What are some alternatives?
When comparing PowerMapper and FlowMapp, you can also consider the following products
DYNO Mapper - Create Sitemaps with the DYNO Mapper Visual Sitemap Generator.
Really Good UX - A library of screenshots for UX inspiration
A1 Sitemap Generator - A1 Sitemap Generator has been in active development and sold since 2005.
XML-Sitemaps.com - Free Online Google Sitemap Generator.
VisualSitemaps - Autogenerate visual sitemaps in seconds.
GlooMaps - Create your visual sitemap on the go - easy peasy