x86 is all little-endian. 68k was big endian. "large" PPC, MIPS and ARM chips can theoretically be run in either mode, and small ARM chips and Tensilica (ESP*) can select for endianness at design time, and sometimes at reset time, but ... you hardly ever see them in big endian mode. All the popular Cortex-M (SAM, Nordic) chips are little endian. AVR is little-endian even though it's theoretically irrelevant.
(WestfW has spent many hours getting big-endian networking code to run on little-endian processors.)