If you need a chemical structure editor but do not have the budget for commercial software like ChemWindow or ChemDraw, several high-quality, completely free applications are available: Oregon State University ACD/ChemSketch Freeware Highlights

has gained massive popularity for its sleek interface and cross-platform compatibility. Key Features:

To download ChemWindow 6.0 for free, follow these steps:

Here are the best free alternatives (100% legal):

| Software | Platform | Key advantage over ChemWindow 6.0 | |----------|----------|-------------------------------------| | ChemSketch (ACD/Labs) | Windows | Free for academic use. Includes 3D viewer and IUPAC naming. | | MarvinSketch (ChemAxon) | Windows, Mac, Linux, Web | Industry standard. Supports SMILES, InChI, and hundreds of plugins. | | KingDraw | Windows, Android, iOS | Modern UI, cloud sync, touch-friendly. Completely free. | | Biovia Draw (formerly Accelrys) | Windows | Free for academics. Clean interface. Direct export to Word. | | JSME Molecular Editor | Web-only | No installation. Works in any browser. Perfect for quick drawings. |