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TempleOS is an operating system built entirely by one man, Terry Davis.
Davis believed that TempleOS is the Third Temple  prophesied by the Bible. It is coded in a variation of the coding language C that he dubbed HolyC. 
He received a revelation from God that spurred him to create the project and stated that he had been given the gift of divine intellect. 
Davis was also a diagnosed schizophrenic and died on August 11, 2018 after being hit by a train.