2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/226533We present a new tool for editing Feynman diagrams as well as several extensions in version 5.3 of the package FormCalc for the calculation of Feynman diagrams.8 pages, contribution to the proceedings of the ACAT workshop, Amsterdam, April 23-27, 2007High Energy Physics - Phenomenologytext