1. Arduino Boards
These are the most popular and affordable IoT development boards. They have an Arduino microcontroller and support various sensors and actuators. They are ideal for beginners and simple IoT projects.

2. Raspberry Pi Boards
These boards are based on mini computers like the Raspberry Pi 3 and 4. They have more power and memory than Arduino boards, making them suitable for complex IoT projects.

3. NodeMCU Boards
These use the ESP8266 or ESP32 WiFi-enabled microcontroller. They are small, cheap, and easy to program using the Lua scripting language.

More info: What are Managed Storage Services?