Adafruit 1500

The Pololu A-Star 32U4 Prime is a general-purpose programmable board based on Atmel’s ATmega32U4 AVR microcontroller and arranged in the common Arduino form factor exemplified by the Uno R3 and Leonardo. Pololu 3107

The A-Star 32U4 Prime SV is a programmable board based on Atmel’s ATmega32U4 microcontroller and arranged in the common Arduino form factor. The A-Star Prime offers many additional features and improvements over competing products. Pololu 3115

The A-Star 32U4 Mini LV is a programmable module based on the ATmega32U4 from Atmel. Unlike competing products, it has an onboard switching step-up/step-down regulator that allows it to be powered efficiently from a 2.7 V to 11.8 V supply. Pololu 3103

The A-Star 32U4 Mini ULV is a programmable module based on the ATmega32U4 from Atmel. Unlike competing products, it has an onboard switching step-up regulator that allows it to be powered efficiently from a 0.5 V to 5.5 V supply. Pololu 3102

IoT development board the size of Arduino, equipped with an ARM Cortex-M3 processor (STM32F205) and a Wi-Fi communication module (with an integrated antenna and uFL connector). SparkFun DEV-13321

Tiny (18 x 44 mm) breadboard-friendly development board, easy to use, hacker friendly. ATmega328 brains32KB of flash (1/2 K is reserved for the bootloader), 2KB of RAM, clocked at 16MHz. Adafruit 2590

FLORA is Adafruit\'s fully-featured wearable electronics platform. It\'s a round, sewable, Arduino-compatible microcontroller designed to empower amazing wearables projects. Adafruit 659

DEV-13342

Evaluation kit with Bluetooth 4.0 module. It has 8 digital pins, 4 analog pins and 4 PWM. Compatible with Arduino, it is perfect as a platform for building a small robot. DFRobot DFR0351

Microcontroller board based on Leaf Maple, STM32F103RB, USB, RoHS

KIT-14051

This board combines the simplicity of the UNO’s Optiboot bootloader (which is used in the Pro series), the stability of the FTDI (which we all missed after the Duemilanove was discontinued) and the R3 shield compatibility of the latest Arduino UNO R3.  SparkFun DEV-13975

Qduino Mini is a tiny, Arduino-compatible board with ATmega32u4 (8MHz, 32kB Flash, 2kB RAM), a LiPol battery connector and charger built-in. SparkFun DEV-13614

The board is equipped with ATSAMD21 microcontroller with ARM Cortex-M0 core and SPI Flash memory, GPIO pins and RGB diode. Adafruit 3505

Beetle is a extremely the smallest Arduino leonardo board with Atmel AtMega32u4. 16MHz clock time and has expanded amounts of interfaces: 10 digital pins, 5 analog pins and 4 pwn pins. DFR0282

The SparkFun AST-CAN485 board is a miniature Arduino in a compact Pro Mini housing with a built-in CAN (Control Area Network) and RS485 ports. Sparkfun DEV-14483

Development board with ATmega4809 microcontroller and Microchip ECC608 cryptographic chip. It is equipped with 6 analog input pins, 14 digital inputs/outputs (5 as PWM output) and Grove ports. Seeed Studio 102010288

Module with ATmega328 microcontroller from the AVR family (32 kB Flash, 2 kB SRAM, 1 kB EEPROM). The module has 14 I/O lines, 6 PWM channels, 8 analog inputs

Development board with SAMD21G18 microcontroller. It offers operating frequency up to 48 MHz, 256kB FLASH memory and 32kB SRAM.