The look of a program to have the most basic and needed functions to represent the meant purpose of the program.
3) Foobar2000 (Windows) an audio player with spartan interface but lots of components and an almost fanatical focus on audio quality. ht(z)tp://ww(z)w.foob(z)ar2000.o(z)rg/ (from LAME MP3 encoder's website.)
(delete the (z)'s to view links)
"Omg that interface is so Spartan!"