CLN17 is not the only closed-loop motor driver. There are several alternatives available, which are also closed-loop drivers and designed with a similar architecture. These drivers comprise a microcontroller, an encoder, and a driver, all integrated onto a single printed circuit board placed at the rear side of the NEMA17 motor.

Quick overview of the alternatives

• USTEPPER S32 by uStepper
• MKS SERVO42C by Makerbase
• MECHADUINO by jcchurch13
• XDrive by unlir
• BTT S42C by BigTreeTech (not open-source)
• Smart Stepper by Misfittech

A comparative table of thiese drivers can be found here

Is there anything else?

There are several other similar products available, but they haven't been described due to the project's confidentiality or lack of information.

• Emm42 by Macrobase-tech. Status: proprietary
• AnanasStepper by AnanasRobot. Status: V3.0 not released
• PANdrive by Trinamic. Status: proprietary