Unit Converter Ultimate - A simple, lightweight, Material Design themed unit converter for Android.
MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming
unitMeasure - A sleek unit calculator for android
GNU Octave - GNU Octave is a programming language for scientific computing.
VATCalculators.co.uk - Free UK VAT calculator. We have created this VAT calculator as a free to use tool for calculating VAT rates in the UK.
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.