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OS: Linux, Mac

License: Freeware, GPL

XDrawChem is a two-dimensional molecule drawing program for Unix operating systems. It is similar in functionality to other molecule drawing programs such as ChemDraw (TM, CambridgeSoft). It can read and write MDL Molfiles, and read ChemDraw text and binary files, to allow sharing between XDrawChem and other chemistry applications, and it can create images in popular formats like PNG and EPS. XDrawChem has been tested on Linux, SGI IRIX 6.5, Sun Solaris, Mac OS X, and Windows.

Features include:

Fixed length, fixed angle drawing.
Automatic alignment of figures. Detects structures, text, and arrows and places them automatically.
Can automatically draw rings and other structures - has all standard amino acids and nucleic acids in built-in library.
Can retrieve structures from a network database based on CAS number, formula, or name. Can also retrieve information on a molecule in a drawing.
Can draw symbols such as partial charge, radicals, etc.
Can read MDL Molfiles, CML , ChemDraw(TM) binary format, ChemDraw(TM) XML text format.
Can write MDL Molfiles, CML, ChemDraw(TM) XML text format.
Can also read and write any format supported by the current release of OpenBabel.
Can export pictures in PNG, Windows bitmap (*.bmp), Encapsulated PostScript (EPS), and Scalable Vector Graphics (SVG).
Can generate 3-D structures with the help of the external program BUILD3D.
Online help, including tool tips.
13C-NMR prediction
1H-NMR prediction, based on additive rules and functional group lookup methods
Simple IR prediction.
Simple pKa estimation.
Octanol-water partition coefficient estimation.
Reaction analysis: gas-phase enthalpy change estimate, 1H NMR and 13C NMR comparison.
Integration with OpenBabel, allowing XDrawChem to read and write over 20 different chemical file formats.