Draw.IO is basic Shape and Object Manipulation Tool that is a Plugin which easily works off of your Google Drive. It is easy to quickly create unique designs and even put text on them as well as applying several other usages to redesign your creations. You can then take these and embed them onto your forms for the rest of the world to see. It&'s as easy as grabbing the embed code followed by some quick copy and pasting then you&'re done! It will only show an Image of what you have designed.
JotForm's drawing widgets allows respondants to write freehand within an online form. An example would be a signature collection widget, which you can use to sign off on agreements. Browse JotForm's drawing widgets to collect freehand text online.