| Similarity | Rank | |
|---|---|---|
| Xen | 0.810 | 64317 |
| FreeBSD | 0.802 | 43511 |
| AIX | 0.800 | 75664 |
| SUSE | 0.793 | 84216 |
| Linux | 0.792 | 5281 |
| CentOS | 0.790 | 66620 |
| RedHat | 0.788 | 89416 |
| Fedora | 0.783 | 33321 |
| Debian | 0.762 | 25589 |
| Unix | 0.759 | 21500 |
| VirtualBox | 0.758 | 72778 |
| Ubuntu | 0.757 | 14370 |
| UNIX | 0.756 | 26761 |
| Parallels | 0.746 | 52824 |
| Slackware | 0.745 | 81979 |
| Eclipse | 0.736 | 19274 |
| MacOS | 0.736 | 63038 |
| XenServer | 0.734 | 80726 |
| VMWare | 0.733 | 59206 |
| 12.04 | 0.732 | 99393 |
| JRE | 0.729 | 98414 |
| Cygwin | 0.727 | 92882 |
| Hyper-V | 0.724 | 52860 |
| Mandrake | 0.722 | 90780 |
| ZFS | 0.722 | 84389 |