X-PLOR

{{about|the software package|the trade association|Xplor International}}

X-PLOR is a computer software package for computational structural biology originally developed by Axel T. Brunger at Yale University. It was first published in 1987 as an offshoot of CHARMM - a similar program that ran on supercomputers made by Cray Inc. It is used in the fields of X-ray crystallography and nuclear magnetic resonance spectroscopy of proteins (NMR) analysis.{{cite book|first=Peter |last=Güntert |chapter=Automated protein structure determination from NMR data |editor-last=Dingley|editor-first=Andrew J.|editor2-first=Steven M. |editor2-last=Pascal |title=Biomolecular NMR spectroscopy|journal=Advances in Biomedical Spectroscopy |volume=3 |issue=Biomolecular NMR Spectroscopy |year=2011|publisher=IOS Press|location=Amsterdam|isbn=9781607506942|doi=10.3233/978-1-60750-695-9-338|page=341}}

X-PLOR is a highly sophisticated program that provides an interface between theoretical foundations and experimental data in structural biology, with specific emphasis on X-ray crystallography and nuclear magnetic resonance spectroscopy in solution of biological macro-molecules. It is intended mainly for researchers and students in the fields of computational chemistry, structural biology, and computational molecular biology.