Amazon.com: Seeed Studio XIAO SAMD21The Smallest Arduino Microcontroller Based on SAMD21,with Rich Interfaces, 100% Arduino IDE Compatible, desiged for Projects Need Arduino Micro, 1pc : Electronics
Inhaos Due Core Sam3x8e 32-bit Arm Cortex-m3 Mini Module For Arduino Compatible Iot Mcu 512k Flash 96k Ram 12bit Adc Dac 84mhz - Demo Board - AliExpress
Arduino Uno R4 Due in May With 32-Bit CPU, 16x the RAM and USB-C | Tom's Hardware
Microcontroller Maniacs Rejoice: Arduino Finally Releases the 32-Bit Due | WIRED
Amazon.com: EC Buying STM32F103C8T6 Development Board, STM32 Core Board Embedded ARM Cortex-M3 32-Bit RISC Processor, STM32 Learning System Board Microcontroller Interface I2C SPI Suitable for Arduino : Electronics