https://www.paessler.com/Download_PRTG/30_Day_Trial
赞助PRTG monitors database, mail, web, virtual servers, CPU, memory, traffic, and disk space. PRTG comes with predefined and custom sensors for monitoring CPU, memory, etc. All-in-one.
Types: PRTG Network Monitor, PRTG Enterprise Monitor, PRTG Hosted Monitor