XDrawChem is described as «free software program for drawing chemical structural formulas, available for Unix and Mac OS. It is distributed under the GNU GPL. In Microsoft Windows this program is called WinDrawChem» and is an app in the education & reference category. There are nine alternatives to XDrawChem for a variety of platforms, including Windows, Mac, Linux, iPhone and iPad. The best alternative is Chemaxon Marvin, which is free. Other great apps like XDrawChem are Avogadro, BKchem, JChemPaint and ACD/ChemSketch.