RasMol is a molecular graphics program intended for the visualisation of proteins, nucleic acids and small molecules. The program is aimed at display, teaching and generation of publication quality images.

RasMol reads in a molecule coordinate file and interactively displays the molecule on �the screen in a variety of colour schemes and molecule representations. Currently available representations include depth-cued wireframes, Dreiding sticks, spacefilling (CPK) spheres, ball and stick, solid and strand biomolecular ribbons, atom labels and dot surfaces.

References:
Shanthi V, Selvarani P, Kumar ChK, Mohire CS, Sekar K. SSEP: Secondary structural elements of proteins Nucleic Acids Res. 2003 Jul 1;31(13):3404-5.