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 Proactive Intelligence (com.apple.proactive)

Online searches suggest that this process is part of a "smarter" Siri.

 Neural Engine (com.apple.ane)

The Apple Neural Engine appears to be part of Apple's Machine Learning technologies https://developer.apple.com/machine-learning/

Optimized Battery Charging (com.apple.obc)

https://support.apple.com/en-md/HT212049

mDNSResponder

From what we can determine online, this process is part of Apple's "Bonjour" network device discovery functionality.

Error Tracking (com.apple.runningboardd)

Howard Oakley has written about this process here. eclecticlight.co/2019/11/07/runningboard-a-new-subsystem-in-catalina-to-detect-errors/