"WishTree IoT Dev kit" is a quick IoT prototyping tool.

It enable innovators/makers to quickly develop and create IoT prototypes using any communication- WIFi, Bluetooth, BLE, GSM, LoRa- all on the same board. It accommodates #ESP8266 and #ESP32, and has adapters for commonly used peripherals like RTC, OLED, memory card modules etc.

Documentation & schematic: wisethingz.com/wishtree/

Some salient features:
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Credit card sized board
Runs 5v and 3v3 on-board to connect all types of sensors and displays
Communication: WiFi, BT, BLE, GSM, LoRa
Micro-amp level deep-sleep
Power connections: Screw terminals, USB
Powered by: AA-battery, LiPo with CC-CV charger, Solar panel
Coding through Arduino IDE