A small motor with a plastic 120:1 gear, the output shaft at an angle of 90°, operating voltage 4.5 V, current consumption from 0.08 A to 0.8 A, speed 120 RPM and a maximum torque of 1.4 kg*cm. Pololu 1123

Solarbotics GM9 143:1 Gear Motor 90 deg. Output

Solarbotics GM3 224:1 Gear Motor 90 deg. Output

Solarbotics GM6 120:1 Mini Gear Motor Offset Output

L3G4200D 3-Axis Gyro Carrier with Voltage Regulator

Bipolar stepper motor. It has a resolution of 200 steps/revolution (1.8 ° per step), has a nominal voltage of 7.4 V, and draws a current of 0.28 A per coil. Pololu 1207

Pololu Universal Aluminum Mounting Hub for 5mm Shaft Pair

A4988 Stepper Motor Driver Carrier with Voltage Regulators

Bipolar stepper motor. It has a resolution of 200 steps/revolution (1.8° per step), a rated voltage of 10 V, and draws a current of 0.5 A per coil. Pololu 1208

A4988 Stepper Motor Driver Carrier

Bipolar stepper motor. It has a resolution of 200 steps/revolution (1.8° per step), a rated voltage of 3.9 V, and draws a current of 0.6 A per coil. Pololu 1204

Bipolar stepper motor. It has a resolution of 200 steps/revolution (1.8° per step), rated voltage of 3.8 V, and has a current consumption of 0.67 A per coil. Pololu 1205