FX Equation is a very fast way to produce mathematical and scientific equations. It provides an equation creation environment that really is very quick.
FX Equation 5 has a Mac version as well as the new FX Autoquate, automatic equation detection system which will automatically determine what parts of your entry are text and what are equations.
To use FX Equation, you just type the equation. FX Equation sees at what you have typed and puts everything in the right place without having to touch the mouse.