iMOD is an versatile toolkit to perform Normal Mode Analysis (NMA) in internal coordinates (IC) on both protein and nucleic acid atomic structures. Vibrational analysis, motion animations, morphing trajectories and Monte-Carlo simulations can be easily carried out at different scales of resolution using this toolkit.

References
José Ramón Lopéz-Blanco, José Ignacio Garzón and Pablo Chacón. iMod: multipurpose normal mode analysis in internal coordinates. Bioinformatics (2011) 27 (20): 2843-2850.