Many external packages and web sites can generate input files for CHARMM or process CHARMM output files for analysis and visualization. Input files/setup CHARMM-GUI VMD OpenBabel MMTSB Force field parameters and Models CHARMM force fields CGenFF FFParam GAAMP Glycan modeling Go Model generator genrtf SwissParam Analysis MMTSB ptraj ST-analyzer MMTK Visualization VMD PyMOL Chimera