Here we have a Stepper motor driver / controller that is perfect for driving 2 motors.
The SN754410 Quad Half H-Bridge Driver is capable of driving high voltage motors using TTL 5V logic levels, the SN754410 can drive 4.5V up to 36V at 1A continuous output current! Please see datasheet for more information. This is a pin to pin compatible replacement for the L293D.
Other features of this chip include back-emf diode protection, and automatic thermal shutdown which automatically throttles current flow back until the chip cools down again.
The SN754410 is a monolithic integrated, high voltage, high current, 4-channel driver.
Below is a very simple example of how you can use this item with your arduino or atmega circuit.