Total Network Inventory: Professional PC audit and network inventory management software - fits best for a for companies of all sizes. Free for 60 days.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Network Inventory Advisor - Network Inventory Advisor audits all network software and hardware simply and efficiently
ManageEngine RecoveryManager Plus - RecoveryManager Plus is one such enterprise backup solution which has the ability to easily backup and restores both the domain controllers and virtual machines.
Lansweeper - Lansweeper discovers Windows, Linux and Mac machines in your network.
Lastpass - LastPass is an online password manager and form filler that makes web browsing easier and more secure.
Nmap - Nmap Free Security Scanner, Port Scanner, & Network Exploration Tool. Download open source software for Linux, Windows, UNIX, FreeBSD, etc.