Technical Papers / PDFs Links

Technical Links
OpenCV - Face Detection using Haar Cascades
OpenCV - Cascade Classifier Training
The Modbus Protocol In-Depth (National Instruments)
Simply Modbus

Web Tools / References
App Synthetic Monitor - Monitors Websites and Servers
PingTool.org - Ping Utility
USB.org - USB Implementers Form, Inc
Media Types - A list of Audio or Video Media Types
Archive.org - WayBackMachine, view Websites from over the years

Links to Third Party Calculators
Dylan Hoen's Depth of Field & Diffraction Trade-Off Calculator
Constants
NIST Physical References
Math Formulas
Engineering Formula
Design References
(ISO) International Organization for Standardization
Material Properties

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