bookmark relax Allows to study molecular dynamics by analyzing nuclear magnetic resonance (NMR) relaxation data. Relax has been written as a modular collection of data analysis tools. A Graphical User Interface (GUI), developed for model-free analysis, is integrated into the software package. The program supports several analysis such as Model-free analysis, Nuclear overhauser effect (NOE) or Reduced Spectral Density Mapping (RDSM). It can also create the input files for both Modelfree and Dasha, execute both programs in-line, and then read their output.