Free monitor email software for linux

lm-monitor is a daemon that run sensors at a defined interval (15 seconds by default) and checks the output
If a sensor value has gone outside the defined limit since the last reading, an email message is sent to one or more administrators, alerting them about the condition so they can take appropriate action.
lm-monitor requires the lm-sensors package and a working email configuration, including the "mail" command.
Enhancements:
- Found and corrected a bug in MailText() that generated unvalid indices into SData member arrays.
- Wrote a script to create an unprivileged system account.
- Added code to drop root privilegies and run as the system account mentioned above.
- The install target creates a separate directory for lm-monitor in $(PIDDIR) (normally /var/run), and sets owner and group to lm-monitor. This is neccesary for lm-monitor to be able to remove the pidfile on exit, after having dropped root privilegies.
- Corrected the manpage regarding the --verify-config option.
- Added --help and --version as valid options (previously only -h and -v was accepted).
- Found and corrected a bug in EvaluateAlarm() where newBits was used instead of oldBits when composing mail messages for restored alarms.

NAT Monitor is a tool to monitor hosts bandwidth usage in a Linux-NAT network.

A daemon collects data and clients display them (currently a GTK app with graph and a text version). It detects new hosts, saves up to 12 hours of data, and has a nice summary statistic.

Link Monitor Applet is a GNOME Panel Applet displaying the round-trip time to one or more hosts in a bar graph.
Main features:
- full ICMP and ICMPv6 support
- configurable scale and delays
- HIG 2.0 compliance

GlassMonitor is a SuperKaramba monitor that has all the basic information in a small space, like:
Main features:
- Cpu usage
- Up time monitor
- Ram and Swap monitor
- Network traffic monitor
- Partitions monitor

UPS monitor is a graphical monitoring application that lets users watch a your UPSs status in real time.
Main features:
- Saves your session if UPS switches to battery power
- Warns you when power is critically low
- Lets you monitor networked UPSes
- Remembers configuration and restarts when you log on
- Extremely easy to use

Snmp Monitor provides a SNMP router and monitoring alarms.

Snmp Monitor is a Scotty extension to monitor SNMP variables on the net. If there are changes to the routers, etc., it can send you a message on your cellular, by email, or via the screen.

Orange Monitor is a system monitoring theme for SuperKaramba.
Main features:
- CPU Load and Temperature (mbmon)
- Used RAM
- Used Space on hda and hda2 (customizable)
- Bandwidth Spent (bars are customizable , Incoming gets full @ 1GB and Outgoing @ 256MB by default)
- XMMS Controls (xmmsctrl)
Inspired on:
- Yaxay Skin for Winamp3
- Pod Icons for LiquidWeather karamba
- SystemTux Karamba

GNU-Monitor is a transactional monitor that allows client/server applications to be developed with minimal effort.
GNU-Monitor project consists of transaction routing modules that ensure data integrity and recovery on abnormal termination.
Enhancements:
- New services .get_server_list and .get_service_list to get configuration info using the gm_cfgview tool.
- A new service .log-level to dynamically change levels of information on log files.
- A final solution for some transaction bugs.