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VHELIBS (Validation HElper for LIgands and Binding Sites) \cite{Cereto_Massagu__2013} assists the non-crystallographer in validating ligand geometries with respect to electron density maps.  \paragraph{Screening} Pharmer \cite{Koes_2011} uses efficient data structures to rapidly screen large libraries for ligand conformations that match a pharmacophore.  Pharmit \cite{Sunseri_2016} is an extension of Pharmer that also incorporates shape matching and energy minimization as part of the screen. It is primarily intended to be used as a backend to a web service.