Scientific

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• pdc
  pdc in the 'bc' style with features designed for programmers. It does not support floating point maths but does provide all the C operators (logical, bitwise, shifts etc.) and implements ISO C oper...
  
• Math Magic Sci-Calculator
  a robust scientific calculator that consists of a backend that can be used on the console, and to build a GTK+ frontend to be used as part of the Math Magic project ...
  
• Kalculate
  provides a user-friendly calculator for the average desktop user. Its focus is to develop features that make it friendly and usable instead of features that provide advanced mathematics ...
  
• edanator
  Edanator is an intuitive graphical binary and hex calculator. ...
  
• rpCalc
  rpCalc is a simple RPN (Reverse Polish Notation) calculator for X. It works much like an HP calculator, and all of the commands can be entered using the keyboard or a mouse. ...
  
• GMatH
  GMatH is the GNOME Mathematical Interface. It currently provides Numerical Python and Yacas with a nice GUI. It also has basic data visualization using the gtkplot widget. ...
  
• grpn
  GRPN is a RPN calculator for the X Window system built using the GIMP Toolkit (GTK). ...
  
• Calculate
  Calculate is a calculator made for scripts. It supports *, /, +, -, and parantheses. ...
  
• ycalc
  Ycalc is an enhanced calculator for X. It supports many more operations and has 99 memories. ...
  
• Aardvark Calculator
  Aardvark Calculator is a simplistic RPN calculator, designed to be used via the keyboard rather than the mouse. ...
  
• Cxc
  cxc is a console calculator that works pretty much like a TI-83. It can handle trigonometric and hyperbolic functions, calculations with scalars, complex numbers, statistics (lists), matrixes, quater...
  
• Handy Calc
  Handy calc is a small commandline calculator similar to GNU bc. It can be very helpful for random calculations during programming, etc. ...
  
• glet
  glet is a simple little expresion evaluating calculator for the gnome panel. It allows you type in simple expressions like '1+1' or sin (3.141), and quickly get a result. ...
  
• KavCalc
  KavCalc is a simple calculator that works on any platform that supports Python and Pygame. ...
  
• Orpie
  Orpie is a fullscreen RPN calculator for the console. Its operation is similar to that of modern HP calculators, but data entry has been optimized for efficiency on a PC keyboard. ...
  
• GraphCalc
  GraphCalc is a GUI graphing calculator. It has features similar to a TI-85. ...
  
• Lcalc
  A simple 4-operation calculator for Linux. ...
  
• aamath
  aamath is a program that reads mathematical expressions in infix notation and renders them as ASCII art. It may be useful to send mathematics through text-only media, such as e-mail or newsgroups. ...
  
• Wcalc
  Wcalc is a very capable calculator. It has standard functions (sin, asin, and sinh for example, in either radians or degrees), many pre-defined constants (pi, e, c, etc.), support for using variables...
  
• elca
  Elca (Extended Line Calculator) is a real-time Perl calculator (i.e., it evaluates expressions immediately as you type them). ...
  
• CIAC
  CIAC (CIAC Is Another Calculator) is a calculator that resembles Matlab. ...
  
• FractalZoomer
  Animation target phase Mandelbrot fractal. (that reminds crystallisation) ...
  
• Easy Stack Calculator
  Easy Stack Calculator is a simple calculator written in ANSI C++ which uses a stack inside to process the equations typed into the command line interface. ...
  
• Leibnitz
  Leibnitz is the calculator you've always wanted (even if you didn't know it!), short of handwriting recognition. Unlike the typical calculator that implements the hand-held pushbutton interface (whic...
  
• R
  R is a language and environment for statistical computing and graphics. ...