Computer Software With SPL Meter, RTA, And More ?

[Snausages01]

I was wondering if anybody knew any good computer software/hardware that can hook up to a laptop and measure SPL and has a RTA. those are the main two thigns id like to have but extras would be better .... also i want something that is pretty accurate (i dunno how much this has to do with the software or hardware...im guessing its more hardware like the mic right?)


Thanks