Organic Sketchpad App for Android
'An environment in which you can easily put together organic compounds. As you continue to create your compound, its name will be updated and displayed.
Support for functional groups, adding/removing/moving points in the compound, and undoing your last move. Want to take a nice, professional-looking screenshot for lessons and other uses? Organic Sketchpad features a handy screenshot utility that gives you a number of options for your photo (including whether to highlight the main chain, label the points on the main chain, whether or not to show the compound's name, etc). The screenshot is then saved to your gallery and uploaded to the Internet so that you can easily share it with others.
Perfect for AP Chemistry students and masters of Organic Chemistry alike.'
This is a free app