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\section{The Octopus code}  Octopus was started around 2000 in the group of professor Angel Rubio who, at that moment, was as at  the University of Valladolid, Spain. The first article using Octopus was published in 2001~\cite{Marques_2001}. Today, the code has grown to 200,000 lines of code. Octopus receives contributions from many developers from several countries and its results have been used for hundreds of scientific publications. The original purpose of Octopus was to perform real-time time-dependent density functional theory (TDDFT) calculations, a method that had been recently proposed at the time for the calculation of excited-state properties in molecules~\cite{Yabana_1996}. Beyond this original feature, over the time the code has become able to perform many types of calculations of ground-state and excited-state properties. These include most of the standard features of a modern electronic-structure package and some not-so-common capabilities.