Gestioip - GestióIP is an automated, Web based IP address management (IPAM) software.
Nmap - Nmap Free Security Scanner, Port Scanner, & Network Exploration Tool. Download open source software for Linux, Windows, UNIX, FreeBSD, etc.
Microsoft IP Address Management Server - IP Address Management (IPAM) in Windows Server® 2012 is an integrated suite of tools to enable...
Angry IP Scanner - Open-source and cross-platform network scanner designed to be fast and simple to use
HaCi - HaCi is an IP address / network administration tool with IPv6 support.
Advanced IP Scanner - Advanced IP Scanner shows all network devices, gives you access to shared folders, and can even remotely switch computers off. Download it Free.