Square Silicone Button PWM Controller - 3 Wire - 3.6V to 12VDC : ID 5436 : $2.50 : Adafruit Industries, Unique & fun DIY electronics and kits
Amazon.com: Speed Controller 12V PWM 4-Wire PC Fan Temperature Semiconductor Speed Controller : Industrial & Scientific
What is PWM and how does it work? - ekwb.com
4-Wire fans
PWM Cable (Female to Female - 20cm) - mindsensors.com
4pin Fan Pwm Cable 1 To 2 Motherboard 4-pin Female To Pwm Fan 4-pin Male Multi-fan Temperature Control Extension Cable Fan Cable - Pc Hardware Cables & Adapters - AliExpress
Survey3 HDMI PWM Trigger Cable - MAPIR CAMERA
EK-Cable Y-Splitter 3-Fan PWM (10cm) – EK Webshop
PWM cable, 12 in. - AndyMark, Inc
PWM Wire / Cable Making Kit - AndyMark, Inc
PWM Male to 2 Female Y-cable 8 in. - AndyMark, Inc
Survey3 HDMI PWM Trigger Cable - MAPIR CAMERA
36in PWM Cable - 4 Pack - REV Robotics
PWM Cable (Female to Female - 20cm) - mindsensors.com
SPARK MAX PWM Cable - 2 Pack - REV Robotics
4-Pin PWM Fan Cable for ZSX Board to Motherboard Chassy Fan Port