AppMon Sniffer Demo on macOS 10.11 (El Capitan)
Open-Source: http://github.com/dpnishant/appmon
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AppMon Sniffer is a part of the AppMon project, it let's you monitor system API calls on native macOS apps.
This video represents my personal opinions and is, in no way, validated/endorsed by any of my past or present employers.