Total Network Inventory: Professional PC audit and network inventory management software - fits best for a for companies of all sizes. Free for 60 days.
Lansweeper - Lansweeper discovers Windows, Linux and Mac machines in your network.
Nmap - Nmap Free Security Scanner, Port Scanner, & Network Exploration Tool. Download open source software for Linux, Windows, UNIX, FreeBSD, etc.
Spiceworks Help Desk - Help desk software features that work for IT
OSP Insight - Enterprise Software, built by OSP Engineers, to plan, build, and operate a better fiber optic network. Connect with us to see why fiber network and broadband operators have chosen OSPInsight for over 25 years.
Kuwaiba - Kuwaiba is an open source, enterprise grade network inventory and CMDB for your telecommunications and IT infrastructure
Alloy Discovery Express - Award-winning network inventory software for IT organizations.