Electronics Assistant is a Free Windows program that performs electronics-related calculations. It includes a resistor colour code calculator, resistance, capacitance and power calculations and more. Details of calculations can be saved or printed. It provides all the functions found in the calculators section of this site and more in a stand-alone user friendly program.
Version 4.31 includes the following features:
Calculation of 555 timer duty cycles < 50%
Calculation of LED resistor power dissipation
Option to calculate resistor for multiple LEDs in series