Harry Whitfield
Planimeter
FreeMeasure Areas of Closed Curves Accurately
WindowsPlanimeter II
FreePlanimeter II: Accurate On-Screen Area Measurement Widget
WindowsNetCalc - an RF Impedance Calculator
FreeEstablish radio frequency network design ideas.
WindowsDrawDemo
FreeUse a free-form drawing tool with various features.
WindowsDMXconverter
FreeDMXconverter: Simplify Your DMX Channel Calculations
WindowsSunrise Calculator
FreeDesktop Calculator for Sun and Moon Times
WindowsDMXdeCoder
FreeEffortless DMX512 Channel Conversion Widget
WindowsPixel Scale
FreePixel Scale Delivers Versatile Desktop Rulings and Area Measurement
Windows