BKchem is a free chemical drawing program, which is written in Python..Some of the features, you can expect:* Drawing (bond-by-bond drawing; templates for common rings; expanding ofcommon-groups; draws radicals, charges, arrows; color support ...)* Editing (unlimited undo and redo capabilities; aligning; scaling;rotation (2D, 3D) ...)* Export/Import (fully supported SVG-, OpenOffice.org-Draw-, EPS-export;basic support for CML1 and CML2 import and export)