Total Network Inventory: Professional PC audit and network inventory management software - fits best for a for companies of all sizes. Free for 30 days.
Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.
Network Inventory Advisor - Network Inventory Advisor audits all network software and hardware simply and efficiently
AppDynamics - Get real-time insight from your apps using Application Performance Management—how they’re being used, how they’re performing, where they need help.
Lansweeper - Lansweeper discovers Windows, Linux and Mac machines in your network.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Kuwaiba - Kuwaiba is an open source, enterprise grade network inventory and CMDB for your telecommunications and IT infrastructure