Freeware for molecular surface and surface normals

From: Skull Crossbones <witch_of_agnessi~at~yahoo.com>
Subject: Freeware for molecular surface and surface normals
Date: Fri, 13 Aug 2004 01:26:57 -0700 (PDT)

Is there any freeware that can generate a molecular
 surface, surface normals and indicate covexity/
 concavity of the surface?
 Thanks in advance
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