what are enterprise supported linux distributions?
 

i know that some linux distros such as ubuntu, fedora or openSUSE have some companies behind theirself that support them and their development.
i want to know about other linux distros that have such a companies supporting them.
is there any list about them?

This would be a good place to start:
http://en.wikipedia.org/wiki/Linux_distribution

Red Hat and SUSE Enterprise Linux are only for sale (although CentOS is the same as Red Hat and free)
Ubuntu and Mandriva are produced by companies, but free (although they will sell you support)
Fedora and OpenSUSE are free, but subsidised by companies because Red Hat and and SEL are based on them

i'm not talking about enterprise linux distros such as redhat or suse linux enterprise.
i am talking about distros that have some companies as sponsor. for example canonical is ubuntu sponsor or novel is sponsor of opensuse and in the other hand linux mint has not any sponsor (although it has some companies that donate it).
So, which distros have sponsor?

I'm not sure that anyone's ever made such a list. It would require quite a bit of searching. Fedora's web site doesn't say "we are sponsored by Red Hat" (I think), but everybody knows. At the bottom of Vector's page it says that they are sponsored by Vault Networks Hosting Services, but I doubt that many people notice.

Actually Ubuntu/Canonical is closer to the RH/SUSE camp as Canonical determines the direction the distro goes, not the community.

Astaro and EnGarde are also commercial distributions that have community versions as well for example.

Then there is Slackware, Inc. that provides paid commercial support for Slackware, in a manner similar to RedHat, though the software itself is free of charge.

I imagine many distributions do now or have in the past received support from time to time from various companies and entities.

Yet more complications! Slackware Inc. support Slackware users, but they don't support Slackware in the sense of paying their hosting bill or anything like that.