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This program materializes the main equations of density\u2010functional theory in the ground state, and of time\u2010dependent density\u2010functional theory for dynamical effects. The focus is nowadays placed on the optical (i.e. electronic) linear response properties of nanostructures and biomolecules, and on the non\u2010linear response to high\u2010intensity fields of finite systems, with particular attention to the coupled ionic\u2010electronic motion (i.e. photo\u2010chemical processes). In addition, we are currently extending the code to the treatment of periodic systems (both to one\u2010dimensional chains, two\u2010dimensional slabs, or fully periodic solids), magnetic properties (ground state properties and excitations), and to the field of quantum\u2010mechanical transport or \u201cmolecular electronics.\u201d In this communication, we concentrate on the development of the methodology: we review the essential numerical schemes used in the code, and report on the most recent implementations, with special attention to the introduction of adaptive coordinates, to the extension of our real\u2010space technique to tackle periodic systems, and on large\u2010scale parallelization. More information on the code, as well as the code itself, can be found at<jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"http:\/\/www.tddft.org\/programs\/octopus\/\">http:\/\/www.tddft.org\/programs\/octopus\/<\/jats:ext-link>. (\u00a9 2006 WILEY\u2010VCH Verlag GmbH &amp; Co. KGaA, Weinheim)<\/jats:p>","DOI":"10.1002\/pssb.200642067","type":"journal-article","created":{"date-parts":[[2006,6,7]],"date-time":"2006-06-07T18:34:10Z","timestamp":1149705250000},"page":"2465-2488","source":"Crossref","is-referenced-by-count":774,"title":["<i>octopus:<\/i>a tool for the application of time\u2010dependent density functional theory"],"prefix":"10.1002","volume":"243","author":[{"given":"Alberto","family":"Castro","sequence":"first","affiliation":[]},{"given":"Heiko","family":"Appel","sequence":"additional","affiliation":[]},{"given":"Micael","family":"Oliveira","sequence":"additional","affiliation":[]},{"given":"Carlo A.","family":"Rozzi","sequence":"additional","affiliation":[]},{"given":"Xavier","family":"Andrade","sequence":"additional","affiliation":[]},{"given":"Florian","family":"Lorenzen","sequence":"additional","affiliation":[]},{"given":"M. A. 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