windows replacement operating system

ReactOS turns 30: The 'open-source Windows' continues to develop quietly.
reactos – the open-source operating system often referred to as 'free windows' – officially celebrates its 30th anniversary, with the goal of running windows applications and drivers in a secure, open environment.
The Russian military will use the Astra Linux operating system instead of Windows
russian military is planning to use a linux kernel operating system called astra linux, developed by a russian company called rusbitech in 2008, to replace microsoft's windows operating system on its military system. .