Welcome to JoyfulCoder.net
Here you will find some useful web applications.

HangMan (or Woman)
This classic word game will teach you a new word every day.

Heart Rate
Calculate various heart rates based on gender and age.

Quadratic Equation
Solve quadratic equations.

Resistor Evaluator
Calculate the resistance of a resistor by it's color bands.

SOH CAH TOA
Solve the missing values of a right-triangle.

When is Easter?
Calculate Easter day for a specified year.