Everybody talks about (and often to) the Big Four virtual assistants — Siri, Alexa, Cortana and Google Assistant. But many other companies are working on virtual assistants, too.

Huawei is working on a virtual assistant for the Chinese market.

Samsung offers Bixby on its Galaxy S8 or S8+ smartphones.

Voice recognition giant Nuance offers an enterprise ready virtual assistant called Nina, which specializes in knowing the limits of A.I. and kicking queries over to a team of human assistants when necessary. Nuance this month announced a Nina "skill" on Amazon's Alexa platform.

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