Kolibri desktop is a small 3MB Operating System, which is written entirely in machine code (CPU Language) and is not based on Linux, Windows or any other variants. What is surprising is the number of applications packed into this tiny file size. There are a whole bunch of games, a basic tables editor, a compiler, a text editor, a bouquet of demos, a text based web browser and more. There is also DosBox, which lets you run almost any DOS game on Kolibri. While not meant for serious use, the tiny OS shows how bloated Windows and Linux really are.
Read more : http://distrowatch.com/weekly.php?issue=20090831#feature