BKchem

BKchem is a free 2D molecule editor written in Python by Beda Kosata. As such, it is largely platform-independent.

Additional recommended knowledge

Weighing the right way

Daily Visual Balance Check

Daily Sensitivity Test

Major features

Drawing:

• Bond by bond drawing
• Straight and curved arrows
• Radicals, lone pairs and charges
• Templates for drawing common structure (users can create their own)
• Simple vector graphics

Editing:

• Unlimited undo/redo capabilities
• Aligning, scaling and rotation (2D and 3D)

Exports to:

• SVG
• OpenOffice Draw
• PDF
• EPS (Encapsulated Postscript)
• Molfile
• PNG (with pycairo installed)
• SMILES (Stereochemistry is not supported)
• InChI (with InChI program)

Imports:

• Molfile
• SMILES (Stereochemistry is not supported)
• InChI (Stereochemistry is not supported)

Other features:

• Searching BKchem files for a molecule or a fragment of a molecule
• Localization support (currently English, French, Czech and Polish translations are available)
• Support for user written plugins
• Validity checking
• Can be run from source with Python

• BKchem official website