I'm looking for these responses. My team is looking for a solution in the next few months also.
What are you looking for the tool to do?
Depending on what you need, there are a lot of tools that were built by Patrick Wardle. He is best known as one of the leading macOS security researchers, and also, he founded the company that eventually was purchased by Jamf and became Jamf Protect. All of his free tools can be found here https://objective-see.com/
Maybe Microsoft Defender if you have a Microsoft Subscription?
The issue I see is that you are wanting something free to be your verification tool.