Free monitoring tools software for linux

KSetiSpy is a KDE utility that monitors the progress of the SETI@home client, and displays all kinds of information about the work unit(s) being processed.
It uses the same interface as SETI Spy, a Windows program written by Roelof Engelbrecht.
The SETI@home project started in May 1999; its goal is to harness the power of distributed computing to analyze radio signals from space, for "the small but captivating possibility of detecting the faint murmur of a civilization beyond Earth".
To participate in this exciting project, all you have to do is to run the SETI@home client program. This program downloads a set of data (usually called "work unit") from the SETI@home servers, processes it on the local machine (using idle processing time that would otherwise go wasted), and then transmits the result back to the servers.
Over time, SETI@home participants people have become more and more interested in learning everything about the data contained in these work units and the computations done on them. To address these needs, several SETI@home monitoring add-on programs were developed. These extract interesting information from the SETI@home client and present it in a user-friendly way.
One of the most complete SETI@home monitoring tools available today is a Windows program named SETI Spy. KSetiSpy has been created with the intent of providing a version of SETI Spy for my favorite desktop environment (KDE). KSetiSpy borrows most of its user interface conventions from SETI Spy, so SETI Spy users will feel immediately at home with KSetiSpy.
KSetiSpy started as a programming experiment in KDE in June 2001, and has grown a lot since then, mainly to keep up with the ever-increasing feature set of its Windows counterpart. Like many open source projects, its basically the work of a single developer (that would be me), working on it on his spare time. Therefore advancement is not linear, and debugging is mostly left to the users (that would be you). If you run into a bug, please report it to Roberto Virga
Enhancements:
- fixed RA and Dec formatting
- fixed julian date conversion (was off by 6 hours - thanks to Bengt-Erik Soderstrom for reporting this)
- fixed constellation links (the P.A.S. re-organized their web site)

cfgstoragemaker remotely generates an MRTG config file in order to graph all storage devices (disk, memory, and swap) of one or more specific host(s) via SNMP.

Cutter is an TCP/IP Connection cutting on Linux Firewalls and Routers.

Cutter is an open source program that uses the FIN-ACK-RST packet technique described above to abort TCP/IP connections routed over the firewall or router on which it is run. It can be called using one of the following four syntaxes.

cutter ip-address

Example: "cutter 10.10.0.45"

Cuts all connections passing through the firewall between any ports on the specified ip-address (either a "private" or "public" address) and any other hosts. This can be used to close down all incoming connections to a particular server, all outgoing connections from a particular client or all outgoing connections to a server.

cutter ip-address port

Example: "cutter 200.1.2.3 80"

Cuts all connections to or from the specified ip-address/port pair. This allows the user to be a little more specific than the previous example and allows targetting of specific services on specific hosts.

cutter ip-address-1 port-1 ip-address-2

Example "cutter 200.1.2.3 22 10.10.0.45"

Cuts all connections between ip-address-2 and ip-address-1/port-1. This allows the user to cut connections between a specified "client" and a particular service on a specified host. Our example closes host 10.10.0.45s SSH connection to server 200.1.2.3.

cutter ip-address-1 port-1 ip-address-2 port-2

Example: "cutter 200.1.2.3 22 10.10.0.45 32451"

Cuts the specific connection between the two ip/port number pairs given.

IMPORTANT WARNING

Cutter has been designed for use as a administrators tool for Linux firewalls. Its use (as is, or modified) for any other purpose is not sanctioned by the author. So - do not use this tool as a parachute, or to dry your cat, chill meat, answer your phone, drive you car, teach your kids to read or attack other peoples computer systems or networks.

This software has been designed for "legal" and "appropriate" use by network security administrators and the like. It has been written as part of a larger Linux firewall project, targetting at controlling traffic from peer-to-peer software such as Kazaa, iMesh and others into and out of a private network. It is not designed as a tool for malicious use and the author in no way sanctions such use.

Users of the software should be aware that its actions are easily detectable using a number of readily available network monitoring tools, and it makes no attempt to disguise its actions. Malicious use of "cutter" could result in a jail sentance in a number of countries around the world.

Darpwatch is a solution for monitoring ethernet activity across many different ethernet networks. Darpwatch is based on the original arpwatch source from UCB.
Main features:
- Modular alert handling - write your own alert handler
- Scalable
- Based on original arpwatch code

The EDDIE Tool is a system monitoring, security and performance analysis agent developed entirely in Python. It runs standalone on a system and performs checks and other actions as defined by an extensible configuration.
The EDDIE Tool can perform all basic system monitoring checks, such as: filesystem; processes; system load; and network configuration.
It can also perform such network monitoring tasks as: ping checks; HTTP checks; POP3 tests; SNMP queries; RADIUS authentication tests; and customized TCP port checks.
Finally, a few checks lend themselves to security monitoring: watching files for changes; and scanning logfiles.
The EDDIE Tool can also send any collected statistic to RRD files to be displayed graphically by any standard RRD tool.
No need to run multiple monitoring and data collection agents. Monitoring rules are just like Python expressions and can be as simple or as complex as needed. Advanced alert control functionality such as exponential back-off and dependencies are also standard.
Enhancements:
- Support for two new platforms: FreeBSD and Microsoft Windows. Solaris 10 support.
- Better support for Linux kernel 2.6.
- SMTP response time monitoring.
- The FILE directive can show diffs when monitored files are modified.
- Disk/filesystem throughput measuring on Solaris.
- Many more enhancements and bugfixes.

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

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.

TorApplet is a simple GNOME applet for managing and monitoring the basic activities of the Tor daemon.