Calc: arbitrary precision C-like arithmetic & calculator
Arbitrary-precision CRC calculator and algorithm finder
A powerful arbitrary-precision calculator.
Computer Algebra System written in Common Lisp
A Portable General-Purpose Computer Algebra System
C++ BigInt class enables to work with arbitrary precision integers
Pure-python binary fixed-point arithmetic library
Computer calculations made easy
Software for exact computing based on interval arithmetic.
A library for working with various complex numbers in Java.