Proxycap - ProxyCap empowers you to divert your PC’s system associations through intermediary servers.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Proxy SwitchyOmega - Proxy SwitchyOmega is the updated version of the proxy settings for easily switching and managing the multiple proxy servers and files within minutes.
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.
FoxyProxy - FoxyProxy is a set of proxy and proxy switcher to reach the content of international market and easily switch between multiple proxies and proxy servers.
Nagios - Complete monitoring and alerting for servers, switches, applications, and services