ketcher

Ketcher is an open-source, web-based molecule sketcher designed for chemists and developers to draw and edit chemical structures directly in a browser. It serves as a core devtool for integrating molecular editing into scientific web applications, supporting SMILES, MOL, and other chemical formats. Its interest lies in providing a free, highly customizable, and cross-platform alternative to proprietary sketching tools, enabling seamless chemical data input in research and education.