  We present an introduction to the study of chaos in discrete and continuous
dynamical systems using the CAS Maxima. These notes are intended to cover the
standard topics and techniques: discrete and continuous logistic equation to
model growth population, staircase plots, bifurcation diagrams and chaos
transition, nonlinear continuous dynamics (Lorentz system and Duffing
oscillator), Lyapunov exponents, Poincar\'e sections, fractal dimension and
strange attractors. The distinctive feature here is the use of free software
with just one ingredient: the CAS Maxima. It is cross-platform and have
extensive on-line documentation.
