ACD/Labs, an informatics company that develops and commercializes software in support of digitalized R&D, today announced that ChemSketch Freeware has been downloaded by over 2.5 million users worldwide., , , , This free version of ChemSketch, intended for academic and personal use, has been available and regularly updated for over 25 years. Students, academics, and scientists use ChemSketch to learn, teach, and share their work via chemical structures, reactions, schemes, and diagrams. Use.