Free simple network monitor software for linux

Very Simple Network Monitor is a complete rewrite of project PHP Monitoring.
Its by default capable of monitoring via ping, UDP and TCP checks. Has builtin plugin system so customized scripts can be used to monitor whatever you like eg. oracle tablespaces, diskspace whatever; Alarms are also generated via plugins, it has standard EMAIL alarm, but can be customized to have snmp traps, or sms gateways or whatever.
Can store uptime reports in mysql and generated reports and uptimes in % availability per service.
Has one centralised html monitoring page with all alarms together for good overview.
Enhancements:
- reporting bug fixed
- alarm causes nmonitor to be locked bug fixed
- some other minor stuff I cant remember
- removed some typos from INSTALL doc:)

Simple Monitor is a SuperKaramba theme inspired by the simple but effective "Very Simple Monitors" theme by the user humanthing. Some values are not displayed properly though in Very Simple Monitors (network values and IP). This could be because of different setups. My computer is pretty standard so my theme should function properly on most pcs. http://www.kde-look.org/content/show.php?content=48973
I like a tight and clean desktop, so I simplified the idea even more. This theme is showing all basic information, and nothing more.
Main features:
- Processors type
- Processor speed
- Processor load (number and graph, for one proc)
- Processor Temperature
- Amount of ram used / amount of ram
- amount of swap used / amount of swap
- amound of HDD space used / amount of HDD space total (for "/root" and "/home")
- HDD temperatue (for "/hda", I could add another drive if requested)
- Computer name
- Computer ip
- Network load (up- and download, values and graph)
- Amount of transfered data thrue internet (up- and download) since last boot
Enhancements:
- Made the three blocks clickable.
- The CPU block opens Processor information
- The Memory block opens KsysGuard (youll need to have it installed to be able open it, obviously. Its in Kubuntu by default)
- the Network block opens your computers ip settings window
- Added a line for your computers uptime
- Changed font colors to very dark gray and very light gray, instead of black and white, to make it look softer.

Network Communicator is a simple script for sending and receiving data over TCP/UDP connections.
It can be useful for testing firewall configurations, routing tables, and similar things.
I had originally written two scripts for testing TCP only: a talker and a listener. Upon failure to properly modify them to support UDP only, I made Netcom. It allows the sending and receiving of TCP or UDP data to arbitrary IPs/Ports and optional from/to files.
Im sure there are already tools like this out there like netcat, but wasnt able to get netcat working properly for UDP also. Either way, here you go and enjoy!
Launch Netcom with no options to view the usage.
Enhancements:
- A complete re-write to support arbitrary source/destination and port forwarding (not tunneling).

NetworkControl is a utility to control and monitor network interfaces, including wireless ones (for which you see a signal strength meter, as shown).

NetworkControl addresses a conspicuous lack in most Linux distributions — most tend to be short on easy-to-use network utilities, even something as trivial as a robust, informative way to log on and off a dialup connection. NetworkControl also provides the connection IP, configuration and statistics (gleaned from "ifconfig" and updated each second), and provides graphic signal levels for wireless interfaces, handy for evaluating a system of wireless devices.

NetworkControl allows you to see network activity at a glance and lets you control your network interfaces in a fast, convenient way. It is designed to be easy to use and informative.

If you have downloaded the binary, just put it in /usr/local/bin, give it executable permissions and run it like this:
networkcontrol

You can make a desktop shortcut with this as its executable target.

If you have downloaded the source package:
Put it in any convenient location.
tar -xjf networkcontrol.tar.bz2
cd networkcontrol.dist
./auto_install.sh

If you dont want the automatic installation or you want to fine-tune the process, instead of running "auto_install.sh", after the unpacking step above, do this:

make -f Makefile.cvs dist
./configure
make
sudo make install

Obviously you may want to modify some of these steps to suit your platform.

PHP Simple Informer is a very simple network services monitoring application written in PHP. PHP Simple Informer can be run as a command line application (PHP compiled as cgi is required) or as a web php file.
Although is very simple, it does its function very well. Is very easy to configure with a single file and a couple of simple lines.
I dont know if this is going to be useful for anybody, but its for me. I have been testing several applications, and all of them are more complex that what I need or they dont perform so simple tasks.
Main features:
- Very simple installation and configuration: one single config file and done.
- Multiple hosts configuration
- Support for special features for services: mysql, http, https.
- Multiple contacts configuration
- Alerts are sent by email or with an executed external command.
- Logs issues to log file.
- Report / status web page.

Simple scAnning Tool is a simple and fast network scanner. Simple scAnning Tool is used to identify network devices and services. The identification is based on recieved data such as banners.

Usage:

sat.py [options] < file_name/ip_range >
sat.py -r [-f < file >]
sat.py -u [-o < host:port >]
sat.py -h

Options:

-i scan ip range, example: 10.1.1.1-10.1.1.2,10.1.2.2
[default]
-t scan targets from file
-n scan targets from file with nmap grepable output format
(nmap switch -oG)
-p < port_range > port range to scan, example: 1-1024,3333,4000-5000 [default
23]
-T scan TCP ports rather then UDP [default]
-U scan UDP ports rather then TCP
-4 scan via IPv4 rather than IPv6 [default]
-6 scan via IPv6 rather than IPv4
-H < number > maximum number of threads [default 100]
-O < file_name > set the output file name [default sat.log]
-V verbose scan mode
-c < file > specify the config file [default sat.conf]
-l < file > specify the srules file [default sat.srules]
-r restore aborted scan
-f < file > specify the restore file [default sat.restore]
-u update srules file from the net
-o < host:port > set the HTTP/FTP proxy for updater
-v show programs version number and exit
-h show this help message and exit

network-config is a simple network configuration tool.

Network-config is a simple and easy to use program that helps configuring the network interfaces for linux-based operating systems. It allows to have multiple configurations for the same computer and to easy configure NAT for internet sharing.

It can also be used to scan for wireless networks. It is written in perl and uses gtk2+, but also works as a command line program.

Aazmat Monitor is a SuperKaramba system monitoring widget.

It was adapted to meet office theme and added a few new monitors all of them are built into there own theme file so you can place them were you like.