XML-Sitemaps.com - Free Online Google Sitemap Generator.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
DYNO Mapper - Create Sitemaps with the DYNO Mapper Visual Sitemap Generator.
Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.
PowerMapper - Create visual HTML site maps and XML sitemaps for search engines of any web site quickly and easily.
Prometheus - An open-source systems monitoring and alerting toolkit.