Any recommendations on free (open source) facial expression analysis software for Emotion recognition ?

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Edward Bonner

https://towardsdatascience.com/the-ultimate-guide-to-emotion-recognition-from-facial-expressions-using-python-64e58d4324ff

Chinaza Godswill Awuchi

Check https://opensourcelibs.com/libs/emotion-recognition

Also check https://www.frontiersin.org/articles/10.3389/fnhum.2021.621493/full

Kiprotich Kiptum

It is assumed that emotional facial expressions (facial emotions) can be correctly identified and classified using the Ekman’s classification and the selected face analysis system