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The atsar command can be used to detect
performance bottlenecks on Linux systems. It is
similar to the sar command on other UNIX
platforms. Atsar has the ability to show what is
happening on the system at a given moment. It also
keeps track of the past system load by maintaining
history files from which information can be
extracted. Statistics about the utilization of
CPUs, disks and disk partitions, memory and swap,
tty's, TCP/IP (v4/v6), NFS, and FTP/HTTP traffic
are gathered. Most of the functionality of atsar
has been incorporated in the atop project.

Apache::Logmonster is a tool to collect log files from multiple Apache Web servers, split them based on the virtual host, sort the logs into chronological order, and then pipe them into a log file analyzer of your choice (Webalizer, http-analyze, AWstats, etc).

AccTail shows extended resource usage
information for all processes that have exited,
unlike top or ps which only detail currently
executing processes. It can be useful in
combination with wtmptail or MultiTail.

Logfmon monitors a set of log files and processes
messages based on a set of regexps. When a message
matches, a command may be executed or the message
may be ignored. Messages that are unmatched are
batched together and emailed every so often.

Jukebox is a collection of reusable components that allow you to create a flexible server-side and middleware framework. It features semaphores and services (not quite your usual set), a Finite State Machine implementation based on Generics, a Datastream framework (data producers, consumers and loggers), and a JDK 1.6 compliant JMX framework based on Annotations.

SRG (Squid Report Generator) is a log file
analyzer and report generator for the Squid Web
proxy. It was created to allow easy integration
with authentication systems such as those that are
used for squid itself. It is fast and flexible,
and can report details down to the individual
files fetched.

tinydns-rrd generates realtime graphs from your
tinydns logs by using rrdtool. It works well with
high traffic DNS servers.

socklog cooperates with the runit package to create a small and secure replacement for syslogd. socklog supports system logging through Unix domain sockets (/dev/log) and UDP sockets (0.0.0.0:514) with the help of runit's runsvdir, runsv, and svlogd. socklog provides a different network logging concept, and also does log event notification. svlogd has built in log file rotation based on file size, so there is no need for any cron jobs to rotate the logs. socklog is small, secure, and reliable.

LineControl allows you to remotely control the Internet connection of a Linux masquerading server using multiple clients. It takes care with the number of clients using the connection and decides upon this number whether the connection should be up or down. The clients show the time the connection is up and throughput statistics. Different connection types are supported, such as analog modems, ISDN, or even cable modems and ADSL devices.

python-jabberbot is a Jabber bot framework for
Python that makes it easy to write simple Jabber
bots. One can use these Jabber bots to provide
information about running systems, to make Web
sites interact with Jabber-enabled visitors, or
notify the bot owner about updates or changes that
are monitored with custom Python scripts.

kfsmd (kernel filesystem monitor daemon) is a
daemon to log and view kernel filesystem changes
using inotify. Its main purpose is to allow
libferris to reindex all updated files while you
are sleeping.

Pantheios is a C/C++ logging API library. It offers an optimal combination of complete type-safety, very high efficiency, genericity, and extensibility. It is simple to use and extend, highly portable (platform and compiler independent), and it upholds the C tradition of only paying for what you use. Pantheios supports logging of message statements of arbitrary complexity, consisting of heterogenous types. Pantheios supports filtering of log messages based on severity level.

Molins is a framework for PHP 5 that was inspired by Struts, but also has much in common with the other sub-projects of Jakarta like Torque and Commons. It features very good integration with Smarty, can work with XSLT, and supports logging, unit testing, and class packaging similar to Java.