The motors are 6 volts and the servo motor is recommended for 5 volts, I am looking for any good options because I am fairly new to this kind of thing.
I have a bunch of L9110H motor drivers that I bought from Digikey. They work great.
As for the servo, as long as you have a stable voltage supply, the Arduino (of your choice or an equivalent board) will be more than enough to controller them all.
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Do you need to control the speed of the motors?
Do you need to control the direction of the motors?
What is the stall current or coil resistance of the motors?
I will need to control the speed of all 3 DC motors and the direction of one of them, and the stall current of all 3 is 9.1A.
For that 3rd motor, you will need a full h-bridge.
For the other 2 motors, you could use simple MOSFET drivers. Alternatively you may be able to use a single h-bridge to control both motors, if you choose carefully. You may be able to use a dual h-bridge module to control all 3 motors.
I would recommend you choose a modern h-bridge which uses MOSFET. They are much more cool and efficient than older designs like L293/L298 which use BJT or Darlington transistors.
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Thank you, Do you have any recommendations for MOSFET drivers? Would this: SN74HCT139N be a good solution to control all 3 motors and have Bi-directional + speed control?
No, that's a demultiplexer. You need h-bridges or MOSFETs.
For the MOSFETs, you could use IRLZ44. Connect their gates to Arduino PWM pins (current limiting resistor is a good idea here, like 330R). Also attach 10K pulldown resistors to those Arduino pins. You must also attach flyback diodes across the motor terminals, 1N400x series would be ok I think.
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Take a good look at the "Medium-power motor drivers" section on this page:
You may not need a driver capable of withstanding the full 9A+ stall current of your motor because some if these drivers will automatically limit the current. Also maybe look for one which can drive 2 motors independently in single direction.
Other forum members with more experience of motors and drivers may be able to help with the selection.
@JCA34F can you help with the selection of suitable driver(s)?
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What are the specs of the individual motors and servo?
I did stumble across that website but I don't know how to set up the driver boards and connect them to the Arduino and motors.
The specs for the motors are:
Operating range: 4.5 - 9.0 Volts
Nominal Voltage: 6
No Load Current: 0.28 A
Max. Efficiency Current: 1.6 A
Stall Current: 9.1 A
And the servo motor has a recommended voltage of 5 volts and a current usage of 3A (going off of an amazon listing as I currently do not own any servo motors)