EtreCheck is described as 'simple little app to display the important details of your system configuration and allow you to copy that information to the Clipboard. It is meant to be used with Apple Support Communities to help people help you with your Mac' and is an app in the OS & Utilities category. There are five alternatives to EtreCheck for Windows, PortableApps.com and Linux. The best alternative is HWiNFO (32/64), which is free. Other great apps like EtreCheck are SIW (Paid), WinAudit (Free, Open Source), hwinfo (Free, Open Source) and SiSoftware Sandra (Free Personal).
WinAudit is an inventory utility for Windows computers. It creates a comprehensive report on a machine's configuration, hardware and software. WinAudit is free, open source and can be used or distributed by anyone.