There is no need to install any agents on the computers, and all scanning is done by standard build-in functionality.

With Lansweeper, it's easy to track and audit all your installed software; you can create powerful software inventory reports to find out which application is installed on which computer.

Overview of LanSweeper 8 Features
Agentless IP Range Scanner
Agentless Active Directory Scanner
Agentless Workgroup Scanner
Exchange & Office 365 Scanning
Windows Cluster Scanning
Virtual Machine Inventory
Switch Port Mapping
Performance Counter Monitoring
Automated Warranty Check
Custom OID Scanning
Built-in Network Reports
IT Dashboards
Software License Compliance
Vulnerability Updates
Technical Details and System Requirements
Supported OS: Windows 10, Windows 8.1, Windows 7
RAM (Memory): 2 GB RAM (4 GB recommended)
Free Hard Disk Space: 200 MB or more