Free operating system

There are several operating system in the computors
.They may be paid or free.
The top free seven operating systems are:-

1. HAIKU,               CLICK HERE
2. OPENINDIANA, click here
3. INFERNO,          CLICK HERE
4. REACTORS.      CLICK HERE
5. UBUNTU.          CLICK HERE
6. FREEBSD.          click here
7. GOOGLE CHROME.CLICK HERE

Key word:computor operating systems