Speccy - Speccy - find the details of your computer's specs. Great for spotting issues or finding compatible upgrades. Download the latest version free.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
HWiNFO - Professional System Information and Diagnostics. Comprehensive Hardware Analysis, Monitoring and Reporting for Windows and DOS. FREEWARE. download. Advertisements.
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.
AIDA64 - AIDA64 is a system information, diagnostics and benchmarking solution for Windows PC.
Nagios - Complete monitoring and alerting for servers, switches, applications, and services