DebiChem 2d structure editors packages

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 of common-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)

Chemtool is a GTK+ based 2D chemical structure editor for X11. It supports many bond styles, most forms of text needed for chemical typesetting and splines/arcs/curved arrows.

Drawings can be exported to MOL and PDB format, SVG or XFig format for further annotation, as a PiCTeX drawing, as a bitmap or as Postscript files (several of these through XFig's companion program transfig).

The package also contains a helper program, cht, to calculate sum formula and (exact) molecular weight from a chemtool drawing file. Cht can either be called directly by Chemtool or on the console.

EasyChem is a program that helps you creating high quality diagrams of molecules and 2D chemical formulas that can be exported to PDF, PS, LaTeX and fig.

EasyChem was originally developed to create diagrams for chemistry books and is now frequently used for this purpose in commercial and non-commercial chemistry-related books.

GChemPaint is an editor for 2D chemical structures with a multiple document interface. Drawn molecules can be searched at NIST Webbook and PubChem.

Xdrawchem is a 2D editor for chemical structures and reactions. It mirrors the abilities of the commercial ChemDraw suite and has file compatibility with it as well as other chemical formats through OpenBabel.

OSRA (Optical Structure Recognition Application) is a utility designed to convert graphical representations of chemical structures, as they appear in journal articles, patent documents, textbooks, trade magazines etc., into SMILES (Simplified Molecular Input Line Entry Specification) or SD files - computer recognizable molecular structure formats. OSRA can read a document in any of the over 90 graphical formats parseable by ImageMagick - including GIF, JPEG, PNG, TIFF, PDF, PS etc., and generate the SMILES or SDF representation of the molecular structure images encountered within that document.