The software freefem has been conceived to ease the preparation and visualisation of data for 2D problems such as partial differential equation solvers.
But freefem is also a good example of the kind of software that can be made once the techniques explained in this course are mastered.
Let us begin by playing with the language Gfem which is at the heart of freefem. Then we shall show how the rudiment graphics of freefem can be expanded with another graphic package: gnuplot .