VintageOS

VintageOS is a never released OS made by Nebula's company "Inspirat Corporation" in February 2018, although Inspirat company has been invented in 2018, but the start of it is in 2006. https://i.imgur.com/iTxK9EO.png

There's also SunflareOS is been created in 1983, that is predcessor of the VintageOS, and owned by Vintage industries.