MathPad is a 100% free smart notepad that allows you to type in math expressions, assign variables, define functions, convert units, add units together and much more. There is no enter button, it automatically evaluates everything you type as you type it. And automatically updates anything dependent on a variable that has been changed or a function that has been redefined. The latest version is available in the links below.

MathPad Minimalist Version screenshot
Various examples of what you can do with MathPad. You can spawn new windows (ctrl+W) and change the color (ctrl+O).

Documentation: here.
Questions, Feedback & Feature Requests are welcome here.

How It Works

Core Features