This page provides you with a computer tool (molecular editor) for drawing chemical molecules, especially simple organic molecules.
In order to view the JSME program you must have javascript enabled in your browser and you should see a screen like the one shown in the image.
Adapted from B. Bienfait and P. Ertl, JSME: a free molecule editor in JavaScript, J. Cheminformatics 5:24 (2013)