Avogadro

7 different such options. To add the chemical elements is easy. Just select them from the dropdown box in the Draw menu. If it is not listed in the menu, just click 'Other' to display the periodic tabl. The fragment library allows you to quickly insert a variety of chemical compounds. Avogadro is compatible with GAUSSIAN, GAMESS, MOPAC and Q-Chem, and can export the models to EPS graphics formats,...