MeatballOS

MeatballOS is an open-source operating system, intended to be used in many types of devices.

1997-1999 - Microsoft Codename: Meatball
It development started in 1997, being a project intended to combine the NT and 9x kernel in only one, adding the new NT features into 9x, and improving the kernel using a new kernel called "Meatball". Also was planne dto be used in various devices, like PDAs, computers, smartphones (From 90s obv) and other devices.