GeoGebra is free and multi-platform dynamic mathematics software for all levels of education that joins geometry, algebra, tables, graphing, statistics and calculus in one easy-to-use package. It has received several educational software awards in Europe and the USA.

Quick Facts
Graphics, algebra and tables are connected and fully dynamic
Easy-to-use interface, yet many powerful features
Authoring tool to create interactive learning materials as web pages
Available in many languages for our millions of users around the world
Open source software freely available for non-commercial users

Interactive geometry, algebra, statistics and calculus
GeoGebra is interactive mathematics software for learning and teaching mathematics and science from primary school up to university level. Constructions can be made with points, vectors, segments, lines, polygons, conic sections, inequalities, implicit polynomials and functions. All of them can be changed dynamically afterwards. Elements can be entered and modified directly via mouse and touch, or through the Input Bar. GeoGebra has the ability to use variables for numbers, vectors and points, find derivatives and integrals of functions and has a full complement of commands like Root or Extremum. Teachers and students can use GeoGebra to make conjectures and to understand how to prove geometric theorems.

Its main features are:
Interactive Mathematics Environment
Built-in spreadsheet with extended skills
Built-in CAS
Allows scripting
Large number of interactive learning and teaching resources at GeoGebraTube

It is also possible to move GeoGebra to a USB flash disk or similar storage unit, in order to run it on any workstation without prior installers, as long as it has Java installed.

More importantly, the tool does not insert new entries into the Windows registry, Start menu or any other areas of the computer.

The interface is made from a regular window with a user-friendly structure, where a few drawing tools are displayed on the upper part of the screen. You can rearrange the two primary panes dedicated to algebraic expressions and graphics, as well as sort the algebraic items by type, dependency, layer, or construction order.

You can add new points to a line, function or curve in the graph, create points inside an object or on its perimeter, attach/detach points, intersect two objects, display a midpoint or center of a segment, circle or conic, as well as generate complex numbers.

Other graphical functions let you create perpendicular or parallel lines, polygons and circles, use a compass, generate a list of angles, translate objects by vectors, insert text and images, inspect functions, zoom in and out, and dozens more. Each expression shown in the Algebra panel can be traced in the graph, animated, or marked as an auxiliary object.

The project can be saved to file for further modifications, shared on the developer's website, printed, as well as exported to file (e.g. HTML, PNG, EPS, GIF), while the settings can be saved as default.

GeoGebra supports multiple languages and font sizes, and allows advanced users to manage tools. It has a good response time and works smoothly, while using a moderate-to-high amount of system resources. To sum it up, GeoGebra provides all the necessary tools (and more) for helping math users create presentations and projects.

Requirements: Java