What are some alternatives?
When comparing PerfectPage and WonderWebWare Sitemap Generator, you can also consider the following products
Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
DYNO Mapper - Create Sitemaps with the DYNO Mapper Visual Sitemap Generator.
UptimeRobot - Free Website Uptime Monitoring
GlooMaps - Create your visual sitemap on the go - easy peasy
StatusCake - StatusCake | Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
XML-Sitemaps.com - Free Online Google Sitemap Generator.