Free zabbix software for linux

ZABBIX is software for monitoring of your applications, network and servers.
ZABBIX project supports both polling and trapping techniques to collect data from monitored hosts.
A flexible notification mechanism allows easy and quickly configure different types of notifications for pre-defined events.
Main features:
- Open Source solution
- Runs on AIX, FreeBSD, HP-UX, Linux, MacOS X, NetBSD, OpenBSD, Solaris, Tru64/OSF
- SQL database for storing configuration, collected data and trends
- Web interface offers minimal learning, ubiquitous access
- Instant drill down from real-time status of IT Services to historical trend and statistics
- Data visualisation and mapping
- High performance native ZABBIX agents for performance and integrity monitoring for virtually all platforms (UNIX, Win32)
- Monitoring of "agentless" environments
- Assuring and monitoring SLA for IT Services
- Monitoring of SNMP (v1,v2,v3) devices

Network Security Toolkit is a bootable ISO live CD and its based on Fedora Core 2.
The toolkit was designed to provide easy access to best-of-breed Open Source Network Security Applications and should run on most x86 platforms.
The main intent of developing this toolkit was to provide the network security administrator with a comprehensive set of Open Source Network Security Tools. The majority of tools published in the article: Top 75 Security Tools by insecure.org are available in the toolkit.
What we find rather fascinating with NST is that we can transform most x86 systems (Pentium II and above) into a system designed for network traffic analysis, intrusion detection, network packet generation, wireless network monitoring, a virtual system service server, or a sophisticated network/host scanner.
This can all be done without disturbing or modifying any underlying sub-system disk. NST can be up and running on a typical x86 notebook in less than a minute by just rebooting with the NST ISO CD. The notebooks hard disk will not be altered in any way.
NST also makes an excellent tool to help one with all sorts of crash recovery troubleshooting scenarios and situations.
Enhancements:
- We are pleased to announce the latest NST release: v1.5.0. This release is based on Fedora Core 5 using the Linux kernel 2.6.18. Here are some of the highlights for this release: the NST Web User Interface (WUI), has been greatly enhanced and cleaned up; extensive additions to managing and analyzing network packet captures; the ability to setup and manage printers; the ability to easily mount many different supported file system types; the ability to manage the NST as a file server (both NFS and CIFS); the addition of the Inprotect package (a Nessus manager); the addition of the Zabbix package (another network resource monitoring tool - similar to Nagios)....