These editors try to give good UX for WYSIWYG :
- https://github.com/sofish/pen
- https://github.com/kenshin54/popline
- http://xing.github.io/wysihtml5/
- http://mattduvall.com/grande.js/
- http://daviferreira.github.io/medium-editor/
- http://orthes.github.io/medium-editor-images-plugin/ (comes with image drag and drop uploads)
- http://jakiestfu.github.io/Medium.js/docs/
- http://lab.lepture.com/editor/