Unblock Security Network
Guard Stone is an Open Source Security Platform, which enables to integrate and deploy open source security tools.
More Info 
Developer: Guardstone
License: Freeware
Operating System: All
The Network Security Response Framework (NSRF) allows for testing different computer security response engines and methodologies.
Developer: Nsrf
License: Freeware
Operating System: BSD; Linux
Firestorm is an extremely high performance network intrusion detection system (NIDS).
Developer: scaramanga.co.uk
License: Freeware
Operating System: All
APSR is a network testing tool, designed to send and receive arbitrary network packets.
Developer: aa-security.de
License: Freeware
Operating System: All
APSR is a network testing tool, designed to send and receive arbitrary network packets.
Developer: aa-security.de
License: Artistic License, GNU General Public License (GPL)
Operating System: Linux, BSD
Dynamic development environment to developer Windows Update pack that can be build 'on the fly' to be integrated into the Windows install source reducing network role out time scales aswell as reducing security threat.
Developer: Winupdategen
License: Freeware
Operating System: All
A useful collection scripts (backup, security, system management, games, network, etc.
Developer: Nude
License: Freeware
Operating System: All
CVS nserver is the almost complete rewrite of network-related CVS code.
Developer: Cvs-nserver
License: Freeware
Operating System: BSD; Linux
NMC ("Network Mapper Console") will be a free open source utility for network exploration or security auditing.
Developer: Nmconsole
License: Freeware
Operating System: All
NagMIN is a enterprise class Network Monitoring System, Powered by Nagios, WebMIN, RRDtool, Nmap, Fping, Net::SNMP, Syslog-NG and other open source software providing web-based administration, and enhanced web portal to help you manage your network.
Developer: NagMIN - Network Monitoring System
License: GNU General Public License (GPL)
Operating System: Platform Independent
Manage your network with a free Network Monitoring Software application.
Developer: Network Monitoring Software
License: GNU General Public License (GPL)
Operating System: Windows, Linux, Unix
NINO is a network management solution to manage routers, switches, servers and applications.
Developer: NINO
License: Artistic License, GNU General Public License (GPL)
Operating System: OS Independent
The Tiger security tools were originally developed to provide a check of UNIX systems on the Texas A&M campus that wanted to be accessed from off campus (clearance through the packet filter).
Developer: Free Software Foundation, Inc.
License: GNU General Public License (GPL)
Operating System: OS Independent
Network Failure is a puzzle game featuring a jumbled up computer network.
Developer: networkfailure
License: GNU General Public License (GPL)
Operating System: 32-bit MS Windows (NT/2000/XP), All POSIX (Linux/BSD/UNIX-like OSes), OS Portable (Source code to work with many OS platforms)
2daybiz Network Community Script has all the features needed to run a successful social networking community like Orkut.
Developer: Jayan
License: GNU General Public License (GPL)
Operating System: Not Available
2daybiz Network Community Script has all the features needed to run a successful social networking community like Orkut.
Developer: Birundha
License: GNU General Public License (GPL)
Operating System: Linux, Windows & UNIX
ActiveXperts Network Monitor is the leading solution for monitoring all aspects of your LAN and WAN servers, workstations and devices.
Developer: http://www.activexperts....
License: Freeware
Operating System: Windows, UNIX, Linux, Novell
ActivXperts Network Monitor is Windows compatible.
Developer: http://www.activxperts.c...
License: Freeware
Operating System: Windows
Track and manage your network with networktracker.
Developer: networktracker.org
License: Freeware
Operating System: Linux, Windows
Network Management Center is a comprehensive network device management tool.
Developer: MV
License: Freeware
Operating System: Windows, Linux