IQmol
IQmol is a free open-source molecular editor and visualization package. It offers a range of features including a molecular editor, surface generation (orbitals and densities) and animations (vibrational modes and reaction pathways).
IQmol is written using the Qt libraries which enables it to run on a range of platforms including OS X, Windows and Linux.
It has been integrated with the Q-Chem quantum chemistry package and offers an intuitive enviroment to set up, run, and analyse Q-Chem calculations. However, it can also read and display a variety of file formats, including the widely available formatted checkpoint file.
Latest News
Warning There is a bug in version 2.0 which, if you attempt to save an open QChem output file, will delete the file. The current version, 2.0.1, fixes this problem. Please note that saving an output file does not actually do anything as no changes are made to QChem output files.
IQmol 2.0.1 is now available which has many new features. Binary distributions are available for OS X and Windows, and source code is available for compilation under Linux. See the downloads page for details.