Summernote
From LimeSurvey Manual
Benefits
- Bootstrap ready
- Have a system for image http://summernote.org/#/features#callbacks-onImageUpload
- i18n : http://summernote.org/#/features#i18n
- MIT license
constraint
- Image default system use Base64 (clear constraint : data size are limited (and we already have forum post) ) but https://github.com/summernote/summernote/issues/72