GNU Octave is a high-level interpreted language, primarily intended for numerical computations. It provides capabilities for the numerical solution of linear and nonlinear problems, and for performing other numerical experiments. It also provides extensive graphics capabilities for data visualization and manipulation. Octave is normally used through its interactive command line interface, but it can also be used to write non-interactive programs. The Octave language is quite similar to Matlab so that most programs are easily portable.Octave has extensive tools for solving common numerical linear algebra problems, finding the roots of nonlinear equations, integrating ordinary functions, manipulating polynomials, and integrating ordinary differential and differential-algebraic equations. It is easily extensible and customizable via user-defined functions written in Octave's own language, or using dynamically loaded modules written in C++, C, Fortran, or other languages.

GNU Octave

Interactive programming environment for numerical computations

GNU Emacs is an extensible, customizable text editor - and more. At its core is an interpreter for Emacs Lisp, a dialect of the Lisp programming language with extensions to support text editing.The features of GNU Emacs include:Content-sensitive editing modes, including syntax coloring, for a wide-range of file typesComplete built-in documentation, including a tutorial for new usersFull Unicode support for nearly all human languages and their scriptsHighly customizable, using Emacs Lisp code or a graphical interfaceIncludes a project planner, mail and news reader, debugger interface, calendar, and more

Apps in the GNU group

GNU Octave

GNU Emacs