Bootstrap Visibility Plugin for CKEditor
The Bootstrap Visibility plugin for CKEditor extends several dialog windows adding a “Responsive Visibility” tab that allows you to control if various elements should be displayed on different screen sizes. This uses Bootstrap 3’s responsive classes. This will only work on websites which are already using the Bootstrap 3.x framework.
ExtraFormAttributes plugin for CKEditor
The ExtraFormAttributes plugin for CKEditor extends the core Forms plugin adding the ability to specify the class & id attributes on various form elements.
html5validation plugin for CKEditor
The HTML5Validation plugin for CKEditor extends the core Forms plugin adding a Form Validation tab onto several elements. This allows you to add HTML5 Form Validation attributes onto your forms inside of CKEditor.