The best free alternative to ChemDraw is Chemaxon Marvin. If that doesn't suit you, our users have ranked more than 10 alternatives to ChemDraw and 16 is free so hopefully you can find a suitable replacement. Other interesting free alternatives to ChemDraw are ACD/ChemSketch, MedChem Designer, JChemPaint and KingDraw.
Marvin suite is a chemically intelligent desktop toolkit built to help you draw, edit, publish, render, import and export your chemical structures and as well as allowing you to convert between various chemical and graphical file formats.
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.
"MedChem Designer 3.0 is a free chemical structure drawing program. MedChem Designer can open SMILES, SDF, MOL, CSK, and RXN file types. Up to 32 compounds can be displayed in one window. Images can be exported in SMILES, SD, MOL, CQF, bitmap, JPG, or PNG formats.
JChemPaint (or JCP for short here) is the editor and viewer for 2D chemical structures developed using the Chemistry Development Kit (CDK).
KingDraw App is a free chemical drawing editor that allows users to sketch molecules and reactions, as well as organic chemistry objects and pathways.
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.
A 2D molecular editing tool for GNU/Linux, Mac OS X and Windows. Its goal is to help you draw molecules quick and easily. Of course your creations can be exported afterwards in high quality in a number of vector and bitmap formats.
MolView is an intuitive, Open-Source web-application to make science and education more awesome!
BKChem is a free (as in free software :o) chemical drawing program. It was conceived and written by Beda Kosata and is currently maintained by Reinis Danne.
The Gnome Chemistry Utils include six chemistry related programs:
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.
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Simple structures are needed.