2 recommended

2
BlockBlock

Block persistently installed apps and services.

It pops up when the apps are encrypting files, installing helper or adding something to login files. You can ether allow it, or terminate them.
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It monitors your mac's mic, webcam and their processes and pops up native notification with choices to either allow it or terminate the process. Also you can look it up in menubar if the mic or webcam are (still) running.
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