Do I have to pay for Linux? Just dont get it!

I have downloaded Virtualbox (free) and installed opensuse 12.1 (free). Brill I now want to install server based linux systems, to test work related products out. The idea being that using virtualbox - free, and a linux os free will help me evaluate products without infringing on os licensing issues....I stress this is not to install a server, stick on a 5 - 10000 user base and then roll out to an entire enterprise, simply, have a virtualbox install image of the linux os, install the necessary products I want to test and can then pass to colleugues for them to evaluate. Are any of these products free and would what I am suggesting cause any potential licensing issues? AIX 5.3 AIX 6.1 LINUX REDHAT EL5/X86_64 64BIT LINUX SUSE SLES10/X86_64 64BIT LINUX SUSE SLES11/X86_64 64BIT :confused:

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