The best replacement for stm32 is stellaris.

The best alternatives to stm32 are rated as following:
★★★★★  stellaris
★★★★  lpc
★★★★  pic32
★★★★  tiva
★★★  efm32
★★★  atmega
★★★  kinetis
★★  msp430
★★  atmel
★★  nxp
★★  avr32
★  dspic
★  nxp lpc

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stm32
stellaris
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