AVR
Arduino Uno WiFi Developer Edition
Mega
Nano
Leonardo
buvar10's ATmega1284 board
BlueDuino (ATmega32u4 with BLE module)
Nano Every
ESP
esp-01
esp-12
Grove esp-07 module
Wemos D1 R2
Wemos D1 mini light
Wemos D1 mini (multiple!)
esp32 dev module from Espressif
Wemos D1 esp32
SAMD
MKR Zero
Crowduino M0
nRF
Seeed Arch Link nRF51
Nano 33 BLE
STM32
Bluepill
I maintain and create networking libraries for all architectures so I need different boards for tests.