Xymon monitors your hosts, your network services, and everything else.
Disk Inspection and Monitoring
Linux performance monitoring on-screen or to CSV file
Nagios network monitoring software is enterprise server monitoring
Monitor or control the progress of data through a pipe
Monitor CPU load and terminal activity, execute command when idle
Enterprise-class, distributed monitoring solution for networks & apps
Pinger alert, STATICTICAL TABLES, send EMAILs or SMS by SMS GATEWAY
Shows memory info about processes