QSignaturePad is a QCubed wrapper for the excellent HTML5 canvas based smooth signature drawing by Szymon Nowak.
Home page for the lib is https://github.com/szimek/signature_pad and demo is at http://szimek.github.io/signature_pad/, where you can see example of use and configuration.
This control is installable by Composer. To install, execute the following on the command line from your main install directory:
composer require qcubed/plugin_signaturepad