There are plenty of tuners out there that offer 'generic' maps that are perfectly safe. Revo, as mentioned, being one. Well, they're kind of generic. You (or your tuner) can alter the boost, timing and fuelling parameters post-map with the dongle thing.
Generic doesn't always equal crap/unsafe.
RR mapping is probably preferable for squeezing out bigger numbers, safely.
There's a huge difference between a decent generic map and playing about with 'free' software, cloned ECUs, and dodgy stuff like that.
Fortunately the consensus of opinion on here is knowledgeable and sensible