- Anteater - http://anteater.drzoom.ch/
A log analyser for MTA logfiles (for example sendmail). (C++) [GNU/Linux, Unix]
- AWStats - http://awstats.sourceforge.net/
A web server logfile analyzer that works as a CGI and/or from command line, and supports multiple languages. (Perl)
- CoCaLoRes - http://cocalores.sourceforge.net/
Resolves IP numbers to hostnames like in Apache, Squid, or other logfiles. It is able to cache lookups in a file. (Perl)
- NetSaint - http://www.netsaint.org/
An active network monitor with plugins to monitor several types of services, e.g. ftp, http, tcp port, disk space. (C) [GNU/Linux, Unix]
- Fireparse - http://freshmeat.net/projects/fireparse/
Emails a report of all packets that have been logged by the kernel's ipchains or iptables packet filtering subsystems. (Perl) [GNU/Linux]
- Netload-Applet - http://netload-applet.sourceforge.net/
A network load monitoring applet for GNOME. (C) [GNU/Linux, FreeBSD]
- Network Grep - http://ngrep.sourceforge.net/
Ngrep is a pcap-aware tool that will allow you to specify extended regular expressions to match against data part of packets on the network. (C) [GNU/Linux, BSD, Windows 95/98/2000]
- NISCA - http://nisca.sourceforge.net/
A network interface traffic statistics reporting and graphing tool. (PHP)
- Peep: The Network Auralizer - http://peep.sourceforge.net/
A network monitoring tool that represents network information via audio output, so that you can hear whether the network as a whole sounds normal. (C, Perl) [GNU/Linux, SunOS/Solaris]
- Iperf - http://dast.nlanr.net/Projects/Iperf/
A tool to measure the maximum TCP bandwidth between two points on the internet. (C++) [Many platforms]
- Ntop - http://www.ntop.org/ntop.html
A tool that shows the network usage. It can be used interactively, or in web mode. (C) [GNU/Linux, Unix, Windows]
- RackView - http://rackview.sourceforge.net
Assists in visualizing a Data Center's computer rack layouts by creating a web page with HTML tables to show a frontview of the racks. Included are brief commandline and CGI scripts to demonstrate its implementation. (Perl) [Linux]
- Fast Track Systems Monitor - http://ftmon.sourceforge.net
A general purpose monitoring engine for use by home users and system administrators (Perl) [Unix, Win32]
- squidefender - http://www.jeroen.se/squidefender.php
Perl script which parses for attacks a squid log file. Allows to run commands or automatically notify the attacker's ISP upon trigger.
- Htmlobserver - http://home.arcor.de/hirnstrom/htmlobserver/index.html
Web page checker based on regular expressions. (Java) [Linux, Windows]
- Calamaris - http://cord.de/tools/squid/calamaris/Welcome.html
Parses the logfiles of a wide variety of Web proxy servers and generates reports. (Perl) [Linux, Unix]
- Zabbix - http://www.zabbix.com/
Software for application and network monitoring - logging, monitoring, capacity planning, availability and performance measurement, and helpdesk information. (C, PHP) [POSIX]
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