Linux distibutions

OpenSuse Linux
Arguably the best distribution available.

Ubuntu Linux
Widely used and very popular.

Fedora Linux
Community version of Redhat.

Suse Linux
Suse Linux for business.

Redhat Linux
One of the originals and probably best known.

Of course if none of these fit the bill, why not find your own?

Various Linux Distributions
Many well known and some not so well known distributions.