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rcron is a powerful tool that helps system administrators in setting up cron jobs redundancy and failover over groups of machines. RCRON ensure that a job installed on several machines will only run on the active one at any time.

There are times when you have to stress test your linux/unix box to see how the proxy, database, memcache or other applications running on top would perform under stress or resource crunch. Enter stress which is a deliberately simple workload generator for POSIX systems. It imposes a configurable amount of CPU, memory, I/O, and disk stress on the system. It is written in C, and is free software licensed under the GPLv2.

FreeRADIUS is the most popular open source RADIUS server and the most widely deployed RADIUS server in the world. It supports all common authentication protocols. It is the basis for many commercial RADIUS products and services, such as embedded systems, RADIUS appliances that support Network Access Control, and WiMAX

Ganglia is a scalable distributed monitoring system for high-performance computing systems such as clusters and Grids. It is based on a hierarchical design targeted at federations of clusters.

View real-time data and statistics from any logfile on any server with SSH, in an intuitive and entertaining way.

osCommerce Online Merchant is a complete self-hosted online store solution that contains both a catalog frontend and an administration tool backend which can be easily installed and configured through a web-based installation procedure. It is an Open Source online shop e-commerce solution that is available for free under the GNU General Public License, it features a rich set of out-of-the-box online shopping cart functionality that allows store owners to setup, run, and maintain online stores with minimum effort and with no costs, fees, or limitations involved. Also there are hundreds of add-ons that are available for free to customize osCommerce Online Merchant online stores.

OSSEC is a great IDS tool but you would agree that the alerts needs to be presented in a nice and cleaner way, however the default ossecwui just does not cut it. Some other IDS systems like snort and sagan have some of the very nice looking interfaces like snorby. Many system administrators struggle with ossec as the default interface is not very informative and is dead plain simple.

arno an IPTABLES Firewall Script is a secure stateful firewall for both single and multi-homed machines. psad is a collection of three lightweight system daemons (two main daemons and one helper daemon) that run on Linux machines and analyze iptables log messages to detect port scans and other suspicious traffic.

The Google Authenticator project includes implementations of one-time passcode generators for several mobile platforms, as well as a pluggable authentication module (PAM). One-time passcodes are generated using open standards developed by the Initiative for Open Authentication (OATH).

RedNoteBook is a open source diary and journal software for Linux, Windows and Mac. It includes a calendar navigation, customizable templates, export functionality and word clouds. You can also format, tag and search your entries. RedNotebook is Free Software under the GPL.