Nmap - Nmap Free Security Scanner, Port Scanner, & Network Exploration Tool. Download open source software for Linux, Windows, UNIX, FreeBSD, etc.
Sirius - An open-source clone of Siri from UMICH
Angry IP Scanner - Open-source and cross-platform network scanner designed to be fast and simple to use
Applied Software - Prepare to work with an industry champion! Applied Software specializes in bridging the technology divide from product to productivity no matter your industry.
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.
Ingram Micro - Delivering global technology and supply chain services to support cloud aggregation, data center management, logistics, technology distribution, mobility device life-cycle and training.