SpeQ Mathematics - SpeQ is a small, extensive mathematics program with a simple, intuitive interface.
Fact Flow - Simple solution to help kids achieve math fluency
Qalculate! - Qalculate! is a multiplatform multi-purpose desktop calculator.
MathCrunch - Learn math stress free
NumWorks - The graphing calculator that makes learning math easier.
Paperspade - Type math easily through just English text!