Total Network Inventory: Professional PC audit and network inventory management software - fits best for a for companies of all sizes. Free for 60 days.
Network Inventory Advisor - Network Inventory Advisor audits all network software and hardware simply and efficiently
ControlUp Real-time - ControlUp Real-time is a powerful solution that provides seamless, useful dashboards to identify and solve problems encountered in virtual desktops and applications of users.
Lansweeper - Lansweeper discovers Windows, Linux and Mac machines in your network.
LogicMonitor - LogicMonitor is the SaaS performance monitoring platform for the world's best IT teams. Deploy Fast, Monitor More, Improve Ops.
Nmap - Nmap Free Security Scanner, Port Scanner, & Network Exploration Tool. Download open source software for Linux, Windows, UNIX, FreeBSD, etc.
SysKit Monitor - Meet SysKit Monitor, a powerful tool for server, app and user monitoring on Remote Desktop Services, Citrix XenApp or Windows Servers