SpeQ Mathematics - SpeQ is a small, extensive mathematics program with a simple, intuitive interface.

MathCrunch - Learn math stress free

Qalculate! - Qalculate! is a multiplatform multi-purpose desktop calculator.

Soulver - Soulver is a software application that functions as a calculator that allows you type a continuous stream of information rather than having to input data into multiple cells.

NoteCalc - Browser-based notepad built for math calculations.

Paperspade - Type math easily through just English text!