Euler Math Toolbox is a simple yet powerful tool designed to compute complex equations, expressions and functions. Euler Math Toolbox (Euler for short) is a numerical and algebraic software, a mixture between a computer algebra system (CAS) and a numerical matrix language. The numerical kernel of Euler is based on a matrix language. This language can not only handle simple numbers, but also vectors and matrices of numbers. Indeed, a large part of the Euler syntax is based on functions written in the Euler programming language. Euler can also produce graphics and save the graphics in various formats, among them PNG and SVG. Graphics can also be imported into the text window, exported to files or to the clipboard. The Maxima subsystem communicates with Euler through pipes. It remains a separated system. However, there are various interactions between Euler and Maxima. Using symbolic expressions, Maxima works completely transparent inside Euler. This is a mighty environment to investigate mathematics.