The basis for marking up and annotating an image online (with both text and drawings). Can save the combining image locally, store it to server via the CKEditor plugin. Has a jQuery plugin that implements this in a simplified way.
Original inspiration: http://www.codeproject.com/Articles/801111/Html-Image-Markup
Original demo: https://dl.dropboxusercontent.com/u/5728198/ImageMarkup/Default.html
New version uses menubar toolset vs rightclick context menu