10 years mature OCS Inventory NG, an OpenSource computer inventory and package deployment system for Win32 and Unix and Apple and Linux. Works with glpi-project.org helpdesk.
This is the fastest Internet port scanner. It can scan the entire Internet in under 6 minutes, transmitting 10 million packets per second.
sn0int is a semi-automatic OSINT framework and package manager.
Open-AudIT is a network auditing application. It is based on the scripting languages of PHP, Bash and VBScript.
WinLLDPService is free, open source and tiny Windows service.
An arpspoofing program that lets users launch spoofed arp requests to disrupt connections in a LAN.
LLDP beacon is open source LLDP broadcast service for windows 32bit/64bit.