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I won't expect to get a full disclosure on that platform.
Judging from URL and the Server-header generated by the instance I'd expect the shop to run on mod_plsql on OAS 11g, and some other evidence seems to confirm that it's not using APEX Listener. Probably some caching component (Web Cache) is also used.
Considering the usage scenario and the fact, that license costs do not apply, I'd be very surprised to find a non-RAC database behind that shop. OS should be something owned by Oracle as well, most likely it's Oracle Enterprise Linux.
Just my personal opinions/perceptions...