If a non-Jewish company has some type of glitch in their system and send me money, can I keep the money or do I need to inform them and return the money? They do not know who I am or that I am Jewish.

  You may save the money for yourself, provided it is legal. See here for a brief discussion on the topic: https://asktherav.com/article-475-may-i-take-advantage-of-a-deal-if-the-price-is-obviously-a-mistake/   Sources: ראה שו"ע אדה"ז הלכות מציאה ופקדון…

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