The L293D Motor Driver/Servo Shield for Arduino is probably one of the most versatile on the market and features 2 servo and 4 motor connectors for DC or stepper motors. That makes it a great shield for any robotic project. The shield contains two L293D motor drivers and one 74HC595 shift register.

This Arduino Compatible Motor Driver Shield is a full-featured product that can be used to drive 4 DC motors or two 4-wire steppers and two 5v servos. It drives the DC motor and stepper with the L293D, and it drives the servo with Arduino pin 9 and pin 10. The shift register expands 3 pins of the Arduino to 8 pins to control the direction of the motor drivers. The output enables the L293D to be directly connected to the PWM outputs of the Arduino.