BKUNIX is an operating system for the Soviet Elektronika BK personal computer. It is based on LSX kernel (a version of UNIX V6) and licensed under the GNU General Public License. It is developed by Sergey Vakulenko and Leonid Broukhis. BK-0010 and BK-0011M require different compilations of the kernel, but other parts are the same. The system supports up to three concurrent tasks and allows mounting up to three file systems.