RasMol is an open-source molecular graphics viewer for proteins, nucleic acids and small molecules. It reads coordinate files and displays interactive structures using wireframe, sticks, ball-and-stick, space-filling spheres, ribbons, atom labels and dot surfaces. Colour schemes and depth cues help distinguish molecular features, while supported formats such as PDB, Mol2, XYZ, CHARMm, CIF and mmCIF suit research, teaching and publication graphics.

RasMol is an open-source molecular graphics viewer for exploring proteins, nucleic acids and small molecules. It is intended for scientists, students and educators who need to inspect molecular structures, explain their geometry or create clear images for reports and publications. By displaying coordinate data as an interactive model, it helps make the spatial organization of atoms and bonds easier to examine than in a coordinate file alone.

The program reads molecular coordinate files and presents the structure in a rotatable on-screen view. Users can choose among representations suited to different questions: wireframes and sticks show bonds, ball-and-stick combines bonds with atom spheres, and space-filling CPK spheres emphasize the volume occupied by atoms. Biomolecular ribbons trace protein or nucleic-acid structure, while strand ribbons provide an alternative view of the backbone. Dot surfaces reveal molecular contours, and atom labels identify selected parts of a model. These options let users shift from an overview to a view that highlights particular structural details.

Colour schemes help distinguish components of a molecule, and depth-cued rendering adds visual depth to wireframe models. The combination of colour and representation makes it possible to present the same structure in different ways for analysis, classroom demonstrations or image preparation. RasMol is also used to produce publication-quality molecular graphics, so a useful view can be arranged for inclusion in scientific material as well as examined interactively on screen.

RasMol supports common molecular data formats, including PDB, Mol2, MDL Mol, XYZ/XMol, CHARMm, CIF and mmCIF. This makes it suitable for viewing structures obtained from different molecular modelling and structural-biology workflows. Researchers can use it to inspect macromolecules, students can compare structural features, and instructors can prepare visual material that illustrates molecular shape and organization. It is a viewer and graphics tool for interpreting coordinate data, rather than a general-purpose chemistry or document-editing application.

The open-source program was originally developed by Roger Sayle and is available at no cost. Source access allows technically minded users and developers to examine or adapt the software. RasMol runs on Windows as well as other operating-system families; the Windows release is suited to interactive molecular viewing and image creation. Its focused interface and range of molecular display styles make it useful when a lightweight scientific graphics program is needed for structure visualization and teaching.

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