Anything that runs off 5V.
Turning that around and looking at starting requirements from the other end of the telescope, what if you want true 5V outputs and not just 5V tolerant and must have 32 bit core?
I know of:
Cypress PSOC4 arm cortex m0
Cypress PSOC5 arm cortex m3
Atmel/Microchip SAMC20 and 21 automotive series cortex m0+ these additionally are one of the few mcu that have CAN FD
Are there any others? including obscure non-arm 32 bitters?
Motorola developed two cores - the CPU16 (the core in the 68HC16) and the CPU32 (based on the 68000 core) - at the same time, intending to mix and match a set of modular peripherals and these two cores to suit a wide range of needs. It turned out most people were either OK with Motorola's existing HC05/HC08 or HC11 cores, or needed the performance of the CPU32.
moto HC05. Yuck. Any youngling that still yearns for the 8 bit era should be forced, as I was, to program these register starved memory deficient craptastic things. That will cure you.