BKchem!

Avogadro is a free, fantastically easy to use molecule editor.

If you are looking for a chemical sketcher or an alternative to your current chemical drawing application, there is no better choice than ChemDoodle. ChemDoodle works on all operating systems (both 32 and 64 bit), has one of the largest feature sets in the industry, has the most customizable graphics, pastes scalable vector graphics into Microsoft Office, iWork and OpenOffice (among others), and can read and write all of our competitors’ formats. This is in addition to our web and mobile ChemDoodle extensions! »

Marvin is a great alternative to the subscription based ChemDraw by CambridgeSoft. It is a collection of tools for drawing, displaying and characterizing chemical structures, substructures and reactions.It will also convert structures you create to various molecular visualiztion formats, such as .pdb and .mol, compatible with programs such as PyMOL and SwissPDB Viewer.

ACD/ChemSketch is a chemically intelligent drawing interface that allows you to draw almost any chemical structure including organics, organometallics, polymers, and Markush structures. Use it to produce professional looking structures and diagrams for reports and publications.

Communicate with the natural language of chemical structures, biological pathways, and models

XDrawChem is a 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.Major features Fixed length and fixed angle drawing Automatic alignment of figures Detection of structures, text, and arrows, and their automatic placement Can automatically draw rings and other structures - has all standard amino acids and nucleic acids in a built-in library Retrieval of structures from a network database based on CAS number, formula, or name Retrieval of information on a molecule based on a drawing Symbols such as partial charge and radicals Reading MDL Molfiles, CML (Chemical Markup Language), ChemDraw binary format, ChemDraw XML text format Writing MDL Molfiles, CML, ChemDraw XML text format Integration with OpenBabel, allowing XDrawChem to read and write over 20 different chemical file formats. Image export in Portable Network Graphics (PNG), Windows bitmap, Encapsulated PostScript (EPS), and Scalable Vector Graphics (SVG) 3D structure generation with the help of the external program BUILD3D Simple spectra predictions, including 13C-NMR, 1H-NMR (based on additive rules and functional group lookup methods), and IR Simple property estimation, including pKa, octanol-water partition coefficient, and gas-phase enthalpy change. »

The Gnome Chemistry Utils include six chemistry related programs: - GChemPaint, a 2D chemical formula editor. - a chemical calculator (computes raw formule, molar weight, mass composition and isotopic pattern). - a molecule 3d viewer using OpenGL to display molecular models. - a crystal structure editor and viewer. - a periodic table of the elements. - a spectrum viewer.

JChemPaint is an editor and viewer for chemical structures in 2D. It is free and open source software, written in Java and so it runs on Windows, Mac OS X, Linux and Unix systems. There is a standalone application (editor), and two varieties of applet (editor and viewer) that can be integrated into web pages.JChemPaint is currently being developed as part of The Chemistry Development Kit, and a Standard Widget Toolkit-based JChemPaint application is being developed, as part of Bioclipse.External links JChemPaint page The Chemistry Development Kit »

MollyCule is a completely free Open Source Chemistry visualisation program for MacOS, Linux and Windows. MollyCule is designed to be a nice, easy to use program to help ordinary people who want to explore Chemistry. It's probably not ideal for PhD researchers, but it's great for high school students and undergraduates.

Cool Chemistry Tool - educational app for Students.Chemist will help you in chemical tasks! Use the Periodic Table just like a computer keyboard. With the Chemist you will learn everything you need to know about the elements, compounds and chemical reactions.

What's your favorite molecule? With ChemJuice, chemical structure drawing is now at your fingertips.