Chalk is described as 'calculator that tries to do right what others do wrong. It wants to prove that a "basic" software calculator can be as handy as a real desktop calculator'. There are more than 25 alternatives to Chalk for a variety of platforms, including Windows, Mac, Linux, Android and iPad. The best alternative is SpeedCrunch, which is both free and Open Source. Other great apps like Chalk are Windows Calculator (Free, Open Source), Numi (Freemium), GNOME Calculator (Free, Open Source) and RealCalc Scientific Calculator (Freemium).
KCalc has everything you would expect from a scientific calculator, plus: Trigonometric functions, logic operations and statistical calculations. A results stack which enables convenient recall of previous calculation results. Precision is user-definable.
TechniCalc is every bit functional as it is beautiful. The modern interface that makes a clean break from traditional pocket calculators. Equations are entered in a natural way, adhering to every detail of hand-written maths.
Features: Complex math expressions with parenthesis, variables, constants and functions Real numbers Complex numbers Residue classes modulo n Fractions (real or complex) Calculations available in four numeral systems: binary, octal, decimal, hexadecimal Numeral system...
Omega Calculator is an intuitive and powerful calculator that can be used for any mathematical computation you need to perform. I built this calculator to be different. It's beautiful, free, and has no ads: the VERY BEST calculator I have EVER used.