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Common Unix Printing System (CUPS)
[634 users on Ohloh]
CUPS provides a portable printing layer for Unix(r)-based operating systems. It has been developed to promote a standard printing solution for all Unix vendors and users. CUPS provides the System V and Berkeley command line interfaces, and uses the Internet Printing Protocol ("IPP") as the basis for managing print jobs and queues. The Line Printer Daemon (LPD) Server Message Block (SMB), and AppSocket (a.k.a. JetDirect) protocols are also supported with reduced functionality. CUPS adds network p...
Wireshark
[587 users on Ohloh]
Wireshark is the world's foremost network protocol analyzer, and is the de facto (and often de jure) standard across many industries and educational institutions.

(Wireshark was known as Ethereal until June 09, 2006)

Nagios
[130 users on Ohloh]
Nagios (formerly Netsaint) is a daemon written in C that is designed to monitor networked hosts and services. It has the ability to notify contacts (via email, pager or other methods) when problems arise and are resolved. Host and service checks are performed by external "plugins", making it easy to write custom checks in your language of choice. Several CGIs are included in order to allow you to view the current and historical status via a Web browser, and a WAP interface is also provided to al...
OpenSolaris
[77 users on Ohloh]
OpenSolaris is an open source project created by Sun Microsystems to build a developer community around the Solaris Operating System technology.
Apache ActiveMQ
[64 users on Ohloh]
Apache ActiveMQ is a fast Message Bus which supports many Cross Language Clients and Protocols and many advanced features while fully supporting JMS 1.1 and J2EE 1.4.
Snort
[41 users on Ohloh]
SnortĀ® is an open source network intrusion prevention and detection system using a flexible rule-driven language, which combines the benefits of signature, protocol and anomaly based inspection methods.
With millions of downloads to date, Snort is the most widely deployed intrusion detection and prevention technology worldwide and has become the de facto standard for the industry.
Bacula
[31 users on Ohloh]
Bacula is a set of programs that allow you to manage the backup, recovery, and verification of computer data across a network of different computers. It is based on a client/server architecture and is efficient and relatively easy to use, while offering many advanced storage management features that make it easy to find and recover lost or damaged files.
ACE
[29 users on Ohloh]
The ADAPTIVE Communication Environment (ACE) is a freely available, open-source object-oriented (OO) framework that implements many core patterns for concurrent communication software. ACE provides a rich set of reusable C++ wrapper facades and framework components that perform common communication software tasks across a range of OS platforms.
InspIRCd
[24 users on Ohloh]
InspIRCd is a modular C++ IRC Daemon (ircd) for Linux, BSD and Windows systems created to provide a stable, modern, lightweight irc server from scratch and provide a vast number of features in a modularised form using an advanced module API. By keeping the functionality of the main core to a minimum we hope to increase the stability and speed of our project and make it customisable to the needs of many users. InspIRCd is designed primarily to be a custom irc server for the chatspike irc network ...
ZABBIX
[24 users on Ohloh]
Zabbix is software that monitors your servers and applications. Polling and trapping techniques are both supported. It has a simple, yet very flexible notification mechanism, and a Web interface that allows quick and easy administration. It can be used for logging, monitoring, capacity planning, availability and performance measurement, and providing the latest information to a helpdesk.
ettercap
[20 users on Ohloh]
Ettercap is a network sniffer/interceptor/logger for ethernet LANs. It supports active and passive dissection of many protocols (even ciphered ones, like SSH and HTTPS). Data injection in an established connection and filtering on the fly is also possible, keeping the connection synchronized. Many sniffing modes were implemented to give you a powerful and complete sniffing suite. Plugins are supported. It has the ability to check whether you are in a switched LAN or not, and to use OS fingerprin...
KVIrc
[19 users on Ohloh]
KVIrc is a free portable IRC client based on the excellent Qt GUI toolkit. KVIrc is being written by Szymon Stefanek and the KVIrc Development Team with the contribution of many IRC addicted developers around the world.
Centreon
[13 users on Ohloh]
Centreon is a network, system, applicative supervision and monitoring tool, it is based upon the most effective Open Source monitoring engine: Nagios. Centreon provides a new frontend and new functionalities to Nagios.

It allows you to be more efficient in your network monitoring, but also allows you to make your supervision information readable by a largest range of users. Indeed, a non technical user can now use the Centreon/Nagios couple to easily understand your network infrastructure ...

IRC Defender
[10 users on Ohloh]
IRC Defender is a program designed for IRC networks, written in perl. It is highly a modular security service which amongst other things will keep virus and trojan drones from your network, allow you to set akills using regular expressions, and will prevent abuse of CGI:IRC proxies.

IRC Defender supports many IRC daemons including:

* bahamut
* dancer
* hybrid
* InspIRCd
* ircd 2.10
* unreal ...

iodine
[8 users on Ohloh]
This is a piece of software that lets you tunnel IPv4 data through a DNS server. This can be usable in different situations where internet access is firewalled, but DNS queries are allowed.

It runs on Linux, Mac OS X, FreeBSD, NetBSD and OpenBSD and needs a TUN/TAP device. The bandwidth is assymetrical with limited upstream and up to 1 Mbit/s downstream.

Ganglia
[7 users on Ohloh]
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. Ganglia is currently in use on over 500 clusters around the world and has scaled to handle clusters with 2000 nodes.
iftop
[7 users on Ohloh]
iftop does for network usage what top(1) does for CPU usage. It listens to network traffic on a named interface and displays a table of current bandwidth usage by pairs of hosts. Handy for answering the question "why is our ADSL link so slow?".
EasyBSD
[6 users on Ohloh]
EasyBSD is a modular automation script designed to assist in the extensive post installation process that is required in FreeBSD. The following are modules that are included with EasyBSD, Checks, Update, Security, Networking, Firewall, Recommended Ports, Tips and Tweaks, Daemon, and Universe.
Cleversafe - Dispersed Storage
[5 users on Ohloh]
Cleversafe provides a dispersed data storage solution.
GroundWork Monitor Open Source
[4 users on Ohloh]
A complete availability monitoring solution that ensures IT infrastructure uptime while identifying issues before they become real problems. Unifies proven open source tools - Nagios, Nmap, sendpage, PHP, Apache, MySQL and more - through PHP/AJAX-based components and an integrated user interface to deliver the extensible functionality you require.