An eye on your system
Enhanced Apache Server Status page - for one or multiple servers
Stream manager
ipset set listing wrapper script
Webbased Dashboard to show the status of your IT infrastructure
Monitoring of websites with spider and email notifications
Monitor your GNU/Linux server with your smartphone
Is your host up or down?
Stormons is a powerful SAN mapping and monitoring program
SNMP adaptor for JMX.
NDPMon - Neighbor Discovery Protocol Monitor
Perl module for accessing the Clickatell Bulk SMS service