Stepper motor forward and reverse controller, limit angle pulse speed – Many Favours
2-phase Biploar Step Motors with High Torque Models
Servo Stepper Motor Controller, Programmable Motion CNC System 4‑Axis Pulse Output WS55H‑E‑1, with Small and Exquisite Size, Large LCD Screen and Easy Operation, for Welding, Drilling(Four Axis) - Amazon.com
PCL601 - Programmable Controllers
AUTONICS, 2 Axis, 64 Steps Per Axis, Stepper Motor Controller - 5PFF9|PMC-2HS-USB - Grainger
EZ4AXIS Stepper Motor Control
57/42 Rotary Encoder Stepper Motor Speed Control with Potentiometer Programmable | eBay