Jmol is a great, free (gpl) program only available for Windows, being part of the category Science & education software with subcategory Astronomy and has been created by JMol Team.
More about Jmol
This program is available for users with the operating system Windows 98 and former versions, and it is available in different languages such as English, Spanish, and German. Its current version is 11.8 and was updated on 6/17/2012.Since the software has been added to our selection of programs and apps in 2012, it has achieved 21,212 downloads, and last week it gained 7 downloads.About the download, Jmol is a light software that needs less storage than most programs in the section Science & education software. It's a software very heavily used in many countries such as India, Israel, and Bosnia And Herzegovina.
Jmol supports the following formats
CCIF/mmCIF, CML, CSF, CTFile, GAMESS, Gaussian 94/98/03 output, Ghemical, HIN, Jaguar, MM1GP, MOL, MOLPRO, MOPAC, NWCHEM, odydata, PDB, QOUT, SDF, SHELX, SMOL, spinput, xodydata, XYZ, XYZ+vib, XYZ-FAH