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KolibriOS is an open source operating system with a monolithic preemptive, science) kernel, video drivers, for 32-bit x86 architecture computers, developed and maintained by The KolibriOS Project Team. KolibriOS is a fork of MenuetOS, written entirely in FASM (assembly language). However, C, C++, Free Pascal, Forth, among other high-level languages and compilers, can also be used in user application development.
English, Russian and Dutch versions are available.

KolibriOS Features

Boots from several devices, NTFS is also supported. You can even start it from Windows (Windows will shutdown).
Graphical user interface based on VESA.
Development kit: code editor with a macro-assembler (FASM) integrated.
TCP/IP stack.
Fits on a single 1.44MB Floppy (many applications are compressed).
Runs with 8Mb of RAM.
Pre-emptive multitasking, streams, parallel execution of system calls.
Supported file systems are FAT12, FAT16, FAT32 (long names support), NTFS (read only).
AC'97 audio codec support for Intel, nForce, nForce2, nForce3, nForce4 and SIS7012 chipsets.
CD and DVD support.
User can change themes directly in OS.