Open Source Monitoring System for performance and availability.
A network security analysis and monitoring toolkit Linux distribution.
Free & Open Community Edition Server in a Complete Virtual Machine
Advanced dork Search & Mass Exploit Scanner
Register of Internet Addresses filtered in Russian Federation
Track your ARP/MAC table changes and so much more
MitM pentesting opensource toolkit
Various TCP/IP servers, clients and network management tools
Web based IPAM tool
Recursive mapping/discovery of network devices via CDP/OSPF
Perl Hacking Tools (BackTrack)