Binary Number Converter - Converts binary numbers from sign and magnitude to one's and two's complement.
Equation Grapher - Graphs mathematical equations (source)
Math Expression Parser - This is a function that takes a math expression as a string, and a value to evaluate it for, and returns the result. For example, parseEq("3x+2", 8); returns 26. It only supports a single variable, x. I used it when creating a graph program to plot points.
*All source code is my property, and may not be distributed or used for profit without the consent of the author.