Monitoring of network services (SMTP, POP3, HTTP, NNTP, ICMP, SNMP, FTP, Telnet, SSH, Gopher, NFS, DNS, Radius, IAX2, SIP, SunRPC, Whois, Rwhois, LPD, NTP) Monitoring of server resources: CPU load, network load, and disk usage, using an agent. Monitoring of the results of any command or script. Monitoring is easily extendable through user-written scripts.