a graphical user interface to bc. It's big advantage: input and output stay visible at all time for correction and comparation. Supports base conversions, scientific constants, number theory functions and more
SymPy is a Python library for symbolic mathematics. It aims to become a full-featured computer algebra system (CAS) while keeping the code as simple as possible in order to be comprehensible and easily extensible. SymPy is written entirely in Python and does not require any external libraries.
GNU Octave is a high-level language, primarily intended for numerical computations. It provides a convenient command line interface for solving linear and nonlinear problems numerically, and for performing other numerical experiments using a language that is mostly compatible with Matlab. It may also be used as a batch-oriented language.
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 operator precedence. Additionally functions are available to perform population counts and byte swaps