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Incomplete list of SAS software packages that can calculate p(r):
• BayesApp (using the BIFT algorithm)
• SasView
• SASFit
• BioXTAS Raw (using the BIFT or GNOM algorithms)
• ATSAS (using the GNOM algorithm)

Moreover, CaPP can calculate the $p(r)$ from a protein data bank (PDB) file and Shape2SAS can calculate the $p(r)$ from a user-defined shape.