As three-dimensional models of chemical objects are essential tools for understanding their intimate structure and function, nowadays molecular graphics techniques allow building, visualizing, and manipulating, of complex molecular structures and their related properties. This paper presents several developments recently achieved in this field, namely: the representation of macromolecular structures such as proteins; the modelization of molecular envelopes as dot surfaces, mesh surfaces, and solid models; the evaluation and visualization of color-coded reactivity indices based on intermolecular interaction energies. The last application is shown to be particularly useful in several applications, such as molecular recognition and drug design.