GeoGebra is free educational mathematics software that links dynamic geometry, algebra and calculus.

Users can produce various constructions including...

• points;
• vectors;
• segments;
• lines; and
  
• conic sections...

...as well as functions, which can be altered dynamically by mouse afterwards.

Direct input, e.g. g: 3x + 4y = 7 or c: (x – 2) ² + (y – 3) ² = 25, is also possible, and a range of commands, including differentiation and integration, are available for use.

An i...