Amazon.com: 4-Port Raspberry Pi USB HUB HAT for Raspberry Pi 4B/3B+/3B/2B/B+/A+/Zero/Zero W, 4 USB Ports Compatible with USB2.0/1.1 Onboard USB to UART Onboard Multi Indicators : Electronics
Sailor Hat for Raspberry Pi (SH-RPi) – Hat Labs
Amazon.com: RS485 CAN HAT for Raspberry Pi 4B/3B+/3B/2B/B+/A+/Zero/Zero W/WH/Zero 2W, Long-Distance Communication via RS485/CAN Function Onboard CAN Controller MCP2515 via SPI Interface Transceiver SIT65HVD230DR : Electronics
RAK9003 PoE Pi HAT – RAKwireless Store
Raspberry Pi PoE+ HAT : ID 5058 : $20.00 : Adafruit Industries, Unique & fun DIY electronics and kits
USB 3.2 Gen1 & Gigabit Ethernet HUB HAT for Raspberry Pi, 3x USB, 1x ETH - RobotShop
Amazon.com: GeeekPi Fan Hat for Raspberry Pi 4 Model B, Raspberry Pi PWM Fan GPIO Expansion Board with 0.91inch OLED Display for Raspberry Pi 4B/3B+/3B/2B : Electronics
Raspberry Pi 4 Fan Case » By C4Labs » Pre-Order now open!
Raspberry Pi 4 Case for dAISy HAT – Wegmatt
Raspberry Pi 4B/3B+/3B X930 HiFi DAC HAT Expansion Board – Geekworm
Witty Pi 4 HAT - RTC & Power Management for Raspberry Pi : ID 5704 : $37.50 : Adafruit Industries, Unique & fun DIY electronics and kits
Adafruit Perma-Proto HAT for Pi Mini Kit - With EEPROM
Top 20 Raspberry Pi HATs & Shields You Should Try - Latest Open Tech From Seeed
Power Over Ethernet (PoE) HAT for Raspberry Pi 3 B+ 4 and 802.3af PoE
HighPi Raspberry Pi Case for Pi4, White - PiShop.us
Amazon.com: Uninterruptible Power Supply UPS HAT for Raspberry Pi Series Boards(Raspberry Pi 4 Model B/3B+/3B) Charge and Power Output at The Same Time,Multi Battery Protection Circuits : Electronics
Amazon.com: Ethernet/USB HUB HAT Expansion Board for Raspberry Pi 4 B/3 B+/3 B/2 B/Zero/Zero W /2 W/Zero WH/2WH, with 1 RJ45 10/100M Ethernet Port, 3 USB Ports Compatible with USB2.0/1.1 : Electronics
Raspberry Pi 4B/3B+/3B X708 V2.0 UPS HAT & Power Management Board with – Geekworm
mjbots pi3hat r4.5 – mjbots Robotic Systems
Adafruit BrainCraft HAT – Machine Learning for Raspberry Pi 4 | Elektor
POE HAT box for Raspberry Pi 4
