https://www.paessler.com/Download_PRTG/30_Day_Trial
赞助PRTG takes care of all network management needs: an all-in-one tool for the entire network. PRTG sensors for network management: SNMP, packet sniffing, WMI, flow & many more sensors
Types: PRTG Network Monitor, PRTG Enterprise Monitor, PRTG Hosted Monitor