Zabbix - Track, record, alert and visualize performance and availability of IT resources
PowerMapper - Create visual HTML site maps and XML sitemaps for search engines of any web site quickly and easily.
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.
Octopus.do - Build your website structure in real-time and rapidly share it to collaborate with your team or clients. Start prototyping websites or apps instantly.
Prometheus - An open-source systems monitoring and alerting toolkit.
FlowMapp - FlowMapp is a UX planning tool for creating visual sitemaps and user flow.