Cos

Chinese operating system referred to as: COS is a operating system by the Institute of Software, Chinese Academy of Sciences and Shanghai Alliance Tong Network Communications Technology Co., Ltd. This is a  jointly designed and developed operating system, released on January 15, 2014 in Beijing's Diaoyutai State Guesthouse. It claims that the system already has 100,000 applications.
 

Which Operating System is the Best - Vote Now | Top Ten Most Popular OS

"Cos" is at the 28th position in this list.

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