This archive contains the codes for calculating normal modes from an atomic structure (PDB format) or a pseudoatomic structure (EM maps represented with a collection of 3D Gaussian functions). The code for the NMA of atomic structures is a modified version of the ElNemo code (http://www.sciences.univ-nantes.fr/elnemo/). The code for the NMA of pseudoatomic structures has been developped by Florence Tama. These codes are used within the ContinuousFlex plugin of Scipion 3.