Ardumoto - two-channel DC motor driver for Arduino

Pololu Dual MC33926 Motor Driver Shield for Arduino

Dual-channel electric motors controller (H-bridge) Arduino Motor Shield Rev3 with L298 for controlling two DC motors or one stepper motor with the possibility of using an electronic brake.

Two-channel DC motor driver designed to work with Arduino boards. The module is based on the H L298 bridge system. It can control two DC motors up to 2 A per channel. SparkFun DEV-14129

Motor-driven expansion board for Arduino, L293D, 74HC595 shift register, RoHS

(DRI0009) 2A Motor Shield For Arduino

Adafruit 16-Channel 12-bit PWM/Servo Shield - I2C interface

This Kit with fully-dedicated PWM driver chip handles all the motor and speed controls over I2C. Only two data pins (SDA & SCL in addition to the power pins GND & 5V) are required to drive the multiple motors; you can also connect any other I2C devices or shields to the same pins. This  makes it drop-in compatible with any Arduino, such as the Uno, Due, Leonardo and Mega R3. Adafruit 1438

This shield makes it easy to control two high-power DC motors with your Arduino or Arduino-compatible board. Its dual robust VNH5019 motor drivers operate from 5.5 to 24 V and can deliver a continuous 12 A (30 A peak) per motor, or a continuous 24 A (60 A peak) to a single motor connected to both channels. Pololu 2507

Pololu - 2511

Pololu 2512Module with 2-channel DC motor driver for Arduino boards. It allows you to control drives with a supply voltage from 6 to 32 V and a current consumption of up to 0.65 A. Pololu 2512

Two axis stepper motor driver expansion board based on the L6470 for STM32 Nucleo

Quad DC Motor Driver Shield is an Arduino compatible DC motor driver that allows you to control 4 DC motors with a voltage between 2.5 ... 13.5V and up to 1.2A. DFRobot DRI0039

DEV-14129

This shield makes it easy to control two high-power DC motors with your Arduino or Arduino-compatible board. Its twin discrete MOSFET H-bridges support a wide 6.5 V to 30 V operating range and are efficient enough to deliver a continuous 18 A without a heat sink.

Pololu Dual G2 High-Power Motor Driver 24v18 is an extension that allows you to control two DC motors designed for Arduino tiles. The motor can be supplied with 6.5 ... 40V voltage and can draw a maximum current of 18A. Pololu 2518