Gratis
Free tool to audit server configurations and document changes
Integrated FISMA compliance solution for federal agencies ($4275 for 150 users)
Automatically disables inactive user accounts based on last logon time
Free tool to audit and report on administrative changes on SQL Servers
Detects Active Directory changes, archives and sends report to administrator
Freeware PowerShell cmdlet that searches for inactive users in Active Directory
IT infrastructure compliance auditing: who changed what in AD, VMware, servers
EMC monitoring tool ($1380 for first file server, $500 per additional server)
Monitors and alerts failed Windows services on multiple computers
Integrated suite of all Netwrix systems management tools ($5100 for 150 users)