μOS (Pronounced MuOS) was a compact operating system developed by Omnisoft Corporation and released on October 29th, 1993, succeeding NanoCMD. It was designed to operate on low-resource x86 hardware, making it ideal for embedded systems, early personal computers and specialized computing environments. μOS became popular for its for its minimalistic design and efficient resource usage, but also having important and useful utilities for developers. μOS also featured a debug version only accessible by Omnisoft employees known as μDEV_SYS which featured additional development tools. It was succeeded by OmniSys on March 3rd, 2000, which was not as well recieved as μOS. After the shutdown of Omnisoft in 2006, the OS and the source code were released for free.