[tarikjn]

Historically, Pantone & Munsell in the US of A.

Pantone is really print-oriented, even if they've surfed on the brand to expand to fashion & cosmetics. That's why the standard Pantone PMS colors don't have whites. Munsell is more general purpose.

But RAL & NCS are also used widely, and will probably both keep going up in popularity for reasons I outlined in my other comment on this thread.