Camera AF Microadjustment - for free Canon, Nikon, Sony - any camera with adjustment
Calib Camera Calibrator Software for Geometric Camera Calibration [Win/Linux] – calib.io
Free Lens Autofocus Calibration Card - Free Download and Guide
DLR - Institute of Robotics and Mechatronics - DLR CalDe and DLR CalLab - The DLR Camera Calibration Toolbox - Software available
HAYEAR 5MP USB Digital Microscope Camera USB Digital Eyepeice Lens Tpye C USB Video Camera for Sience Education Lab Reserch with Free Calibration Software: Amazon.co.uk: Business, Industry & Science