Top Alternatives to GNU Octave

Wolfram Alpha is a computational knowledge engine or answer engine developed by Wolfram Research.

MATLAB (matrix laboratory) is a multi-paradigm numerical computing environment and fourth-generation programming language.

R is an open source programming language and software environment for statistical computing and graphics that is supported by the R Foundation.

Wolfram Mathematica (usually termed Mathematica, Mathematica software suite) is a mathematical symbolic computation program.

Sage offers business management, bookkeeping & accounting software to meet any business need, from small to midsized businesses.

Scilab is an open source, cross-platform numerical computational package and a high-level, numerically oriented programming language.

Maxima is a computer algebra system based on a version of Macsyma.

Python(x,y) is a free scientific and engineering development software for numerical computations, data analysis and data visualization based on Python.

Julia is a high-level, high-performance dynamic programming language for numerical computing.

Spyder is the Scientific PYthon Development EnviRonment: a powerful interactive development environment for the Python language with advanced editing.

fxSolver is a math solver for engineering and scientific equations.

GMDH Shell is an advanced but easy to use tool for predictive analytics and data mining.

FreeMat is a free environment for rapid engineering and scientific prototyping and data processing.