MineOS is half the operating system and half the graphical environment for OpenOS, which comes in OpenComputers mod by default. Oringinally it was developed in Russian, but it supports several languages. MineOS has following features:
Multitasking
Windowed interface with double buffered graphics context
Animations, wallpapers, screensavers and color schemes
Language packs and software localization
User authorization by password and biometrics
Support for file sharing over the local network via modems
Support for client connection to real FTP servers