XmMol is a desktop macromolecular visualization and modeling tool designed to be easy to use, configure and enhance. Its graphics are based on X11, and part of its user interface is based on Motif. Thus it provides a way of displaying structures on any X11 server.

Its main features are:
  interactive graphics of macromolecules on any X11 display. Drawings are performed as wireframes to preserve interactivity. Space filling static images can be obtained by using an interface to external rendering programs such as MolScript and Raster3D.
  strong ability to be interfaced with external programs. A communication protocol allows XmMol to fork external programs called "delegates" and exchange information. This feature allows the easy implementation of new features of XmMol.
  Some modelling tools are supported, such as docking facilities, interactive backbone deformation (part of the Forme package). However, the aim of XmMol is mostly to give each user the opportunity to interface its own methods.