Amazon.com: SB New Motorshield for Raspberry Pi 3,2,1 and Zero This Expansion Board can Control up to 4 Motors or 2 Stepper Motor, 2 IR sensors and a Single ultrasonic Sensor. : Electronics
PiTraffic – Raspberry Pi Traffic Light Shield – Oz Robotics
Prototyping Shield for Raspberry Pi 3/ Pi 2/ Model B+
JOY-iT ProtoShield+ for Raspberry Pi | Elektor
Raspberry Pi 4 X703 18650 UPS Shield with Auto Power On Function – Geekworm
RPI SHD DOUBLER: Raspberry Pi Shield - GPIO port expander at reichelt elektronik
Motor Stepper Servo RPI Raspberry Pi Shield R2, PCA9685 TB6612 – ElectroDragon
Nixie Tube Clock IN-18 Raspberry Pi Hat and Shield for - Etsy
Raspberry PI 4B/3B+ GPIO DIY Proto HAT Shield
Amazon.com: Raspberry Pi 4 SATA Storage, Raspberry Pi 4 Model B 2.5 inch SATA HDD/SSD Expansion Board X825 V2.0 USB3.0 Shield ( Only for Raspberry Pi 4B ) : Electronics