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Molekel is an open-source multi-platform molecular visualization program.

(citation info)

Some of the features available in the new version are:

  • Multiplatform: Mac OS X, Windows, Linux
  • Different methods to speed-up rendering of molecules with support for billboards and view-dependent level of detail techniques
  • Programmable shaders; standard shaders to enhance rendering quality, outline contours and perform sketch-like renderings are provided
  • Visualization of residues (ribbon or schematic)
  • Complete control over the generation of molecular surfaces (bounding box and resolution)
  • Visualization of the following surfaces:
    • Orbitals
    • Iso-surface from density matrix
    • Iso-surface from Gaussian cube grid data
    • SAS
    • SES
    • Van der Waals
  • Animation of molecular surfaces
  • Animation of vibrational modes
  • Export high resolution images for 300+ DPI printing
  • Export to PostScript and PDF
  • Export animation
  • Plane widget to visualize a scalar field: the plane can be freely moved in 3d space and the points on the plane surface will be colored according to the value of the scalar field: a cursor can be moved on the plane surface to show the exact value of the field at a specific point in space.
  • Fully Doxygen-commented source code.