SMath Studio!

MATLAB is a numerical computing environment and programming language. Maintained by The MathWorks, MATLAB allows easy matrix manipulation, plotting of functions and data, implementation of algorithms, creation of user interfaces, and interfacing with programs in other languages. Although it is numeric only, an optional toolbox uses the MuPAD symbolic engine, allowing access to computer algebra capabilities. An additional package, Simulink, adds graphical multidomain simulation and Model-Based Design for dynamic and embedded systems. »

Online math solver, equation library, graphing calculator and science/engineering problem helper.Calculate multiple equations at once, Edit existing formulas and Create new ones, Compute large numbers of values, Plot graphs, Link your results, Solve full problems and Share worksheets with your friends.

Microsoft Mathematics is a desktop graphing calculator that can help you visualize and see mathematical concepts as you’ve never seen them before. Microsoft Mathematics includes ink handwriting support to recognize hand-written problems.

Swift Calcs enables users to effortlessly create and collaborate on interactive computational documents, from any device. Swift Calcs is bringing modern cloud­based, user­centric design paradigms to computational software.

Mathcad is engineering calculation software that drives innovation and offers significant process productivity advantages for product development and engineering design projects.

Giac/Xcas is a free computer algebra system for Windows, Mac OS X and Linux/Unix (license GPL3, for commercial dual-license contact us).

CompPad is an OpenOffice extension to provide live mathematical and engineering calculations within a Writer document, allowing calculations to be documented using all of the resources of OpenOffice. It will have functionality similar to Mathcad, but is not intended to be a Mathcad clone. Rather, I hope it might prove more flexible and extensible, and that it might encourage other free / open-source alternatives to a proprietary engineering "Killer App."

Xcos is a graphical editor to design hybrid dynamical systems models. Models can be designed, loaded, saved, compiled and simulated.

MathStudio, formerly SpaceTime, is the most comprehensive math app available for mobile devices. Whether you need a simple calculator to do your finances or a replacement for your TI graphing calculator, MathStudio is the most powerful and versatile calculator available on the App Store and Android Market.

Derive 6.1: Powerful system for doing symbolic and numeric mathematics. This application is no longer available or supported.

WIRIS cas is an online platform for mathematical calculations designed for education. You can access a powerful calculation toolbar through an HTML page that includes integrals and limits calculation, function graphing in 2D or 3D and symbolic matrices manipulation, among others.

Miramath is an open source project inspired by the MathCad mathematical application. The main user interface consists of a page into which mathematical expressions can be entered or edited and then evaluated.

Program that solves numerically algebraic systems of non-linear, and linear, equations where one only has to write down the equations to obtain the results. It also includes a database of thermodynamical properties for many substances and a symbolic mathematical program to perform mathematical operations. Basically the program is an open source clone of the EES but written in Java.

QtOctave is a front-end for http://alternativeto.net/software/octave/ . Octave is a high-level language for numerical computations, like MATLAB .