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Real time monitoring : RPi-Monitor always keep an eye on your computer
RPi-Monitor is a monitoring tool which keep an eye on your computer and can give you the current status and the history of resources usages in a nice looking and interactive web interface.
RPi-Monitor is design to be light and powerful and doesn't relies on other software to run. It has been deigned to run on embedded device and consume very few system resources.
hardware log monitor that will display log behaviour via various hardware (parallel port, USB devices, ...). You can specify pattern(regexp) in log(s) on which hardware will turn on. It has also some unique ways of visualization of log files.
Check_sys is set of scripts written in Perl which can be used to monitor Linux servers (cpu, memory, swap, load, processes, network, filesystems, uptime, disks' I/O). It collects data and stores it using RRDTOOL library. It can log events through syslog
Netlog is a simple network traffic monitor for Linux, written in Perl. It is very easy to use and suitable for workstations and servers. It can log the traffic on different interfaces and the uptime of the controlled Computer.
mailscanner-mrtg provides configuration files, web pages and related perl scripts for mrtg to monitor your MailScanner (http://www.mailscanner.info/) machine.
Bionanny is a tool for Web Services providers. It allows to monitor other Web Services. It can intercept requests incoming from clients, pass it to the destination Web Service and log number of requests and elapsed time spend by services.
riman - Router Interface Monitor And Notify
NOTE: riman development has ceased, since I discovered Nagios, which does pretty much everything I had in mind for riman :)
riman is composed of perl and php scripts that monitor routers via snmp.
SNARLsnmp is a web application monitor for net-snmp 5.0.3 and higher. it actively monitors performance, content, some logic and is capable to even monitor complex web transactions with highly dynamic URLs and many other features