AR3201 - 2A brush motor controller with FlySky receiver

DC motor driver that allows you to control the movement of two drives using the I2C interface. Board without connectors. Pololu 5056

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

DC motor driver that allows you to control the movement of two drives using the I2C interface. Board with soldered connectors. Pololu 5045

DC motor driver that allows you to control the movement of two drives using the I2C interface. Board without connectors. Pololu 5038

Pololu Dual G2 High-Power Motor Driver 18v22 is an extension that allows you to control two DC motors designed for Arduino tiles. The motor can be supplied with 6.5 ... 30V voltage and can draw up a maximum current of 22A. Polol 2517

Single-channel DC motor driver with an operating voltage from 10 to 45 V and a continuous current up to 40 A. It can be controlled by an analog signal, PWM, UART, RC or by means of built-in buttons. Cytron MDS40B

Pololu Dual MC33926 Motor Driver Shield for Arduino

An H-bridge capable of controlling one DC motor in both directions or two unidirectional motors at voltages from 4.5 to 44 V and continuous currents up to 1.3 A. The module offers three operating modes (PH/EN, IN/IN, half-bridge), built-in current limiting and measurement, and protection against overheating, overload, undervoltage, and reverse polarity. Its compact design, flexible logic power supply (1.8–5.5 V), and simple control make it ideal for robotics, automation, and hobby projects. Pololu 4971

The RoboClaw Solo motor controllers from Basicmicro (formerly Ion Motion Control) can control a single brushed DC motor using USB serial, TTL serial, RC, or analog inputs. An integrated quadrature decoder make it easy to create a closed-loop speed control system. 

This compact breakout board is for ROHM’s BD65496MUV motor driver, which offers an operating voltage range of 2 V to 16 V and can deliver a continuous 1.2 A to a single brushed DC motor. Pololu 2960

Pololu G2 18v15 High Power is a miniature DC motor controller. Power supply for the controller: 6.5 ... 30 V. Current efficiency of the module: 15 A. The module has protection against back voltage and overvoltages. Pololu 1362

Module with DC motor driver DRV8874. It can work with motors supplied with the voltage from 4.5 to 37 V and current consumption up to 2.1 A. Pololu 4035

This add-on board makes it easy to control two high-power DC motors with a Raspberry Pi. Its twin discrete MOSFET H-bridges support a wide 6.5 V to 36 Voperating range and are efficient enough to deliver a continuous 14 A without a heat sink. The drivers offer basic current limiting functionality, and they accept ultrasonic PWM frequencies for quieter operation.

A two-channel DC motor controller with a UART TTL interface. It is powered from 4.5 V to 48 V and can deliver up to 1.8 A per motor. Board with soldered connectors. Pololu 5066

This discrete MOSFET H-bridge motor driver enables bidirectional control of one high-power DC brushed motor. The small 1.3″ × 0.8″ board supports a wide 6.5 V to 30 V voltage range and is efficient enough to deliver a continuous 25 A without a heat sink.

DC motor driver that allows you to control the movement of two drives using the I2C interface. Board with connectors for assembly. Pololu 5049