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.
MathPapa - Solves Algebra problems for you step-by-step
NumWorks - The graphing calculator that makes learning math easier.
Shiny Things - Perfect for students to improve their math abilities