iota-calc is a easy to use programmer's calculator utility. Key Features:
1. Supports a rich expression format, which is in most cases identical to what you would type in your programming language.
2. Support for adding an unlimited number of variables.
3. Built-in debugger that lets you see the expression simplified step by step.
4. Debugger Back-step lets you backup as many steps as you like so that you can replay critical operations.
5. C/C++ operator precedence
6. Mouse optional, all calculator commands and functions can be done using the keyboard alone.
7. Mini-Calc Mode lets your calculator take up very little screen real estate, and yet remain entirely usable.
8. Numerous built-in unit conversions (memory sizes, lengths, areas, volumes, temperatures etc.)
9. Built-in great circle route and straight line distance calculators.

Input/Output Formats:
1. Input: Hexadecimal, Decimal, Binary, Octal, Boolean, and Characters (ASCII*).
2. Output: Hexadecimal (32 bit integer, 32 and 64 bit floating point), Decimal, Binary, Octal, Boolean, Characters (ASCII*, UTF-8 and UTF-16), and Color (24 bit integer).
3. Convert automatically between these types in your expression with the keyboard, a button, or a contextual menu.

iota-calc gives you a super-set of ASCII, (For Macintosh we use Mac OS Roman and for Windows we use ISO Latin 1).

Operators and Functions:
1. Standard: Addition, Subtraction, Multiplication, Division, Modulus, Power, Square Root
2. Grouping: Parenthesis
3. Variables: Previous Answer
4. Bitwise: complement, and, or, xor, shift left, shift right
5. Comparators: equals, less than, greater than, less than or equal, greater than or equal
6. Logical: and, or, and not
7. Logarithms: Natural logarithm, log base 10, log base e, e raised to x
8. Trigonometric: Sine, Cosine, Tangent, Hyperbolic-Sine, Hyperbolic-Cosine, Hyperbolic-Tangent, Arc-Sine, Arc-Cosine, Arc-Tangent (2 Variants), Degrees To Radians, Radians to Degrees
9. Other: Min, Max, Round, Ceiling, Floor, Absolute Value, Sign, Random

The license of this software is Free Trial Software, the price is $19.95, you can free download and get a free trial.