Calcbot for Apple Watch - Calculate, convert, and split tips from your wrist
MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming
SpeQ Mathematics - SpeQ is a small, extensive mathematics program with a simple, intuitive interface.
GNU Octave - GNU Octave is a programming language for scientific computing.
Qalculate! - Qalculate! is a multiplatform multi-purpose desktop calculator.
Wolfram Mathematica - Mathematica has characterized the cutting edge in specialized processing—and gave the chief calculation environment to a large number of pioneers, instructors, understudies, and others around the globe.