IBM's Power chips can run in either little or big modes, but "used a lot" is a stretch
Most PowerPC related stuff (e.g. Freescale MPC5xx found in a bunch of automotiver applications) can run in either big or little endian mode, as can most ARM and MIPS (routers, IP cameras) stuff. Can't think of the last time I've seen any of them configured to run in big endian mode tho.
For the large Power ISA machines, it's most commonly when running AIX or IBM i these days, though the BSDs generally run big too.