We are currently using a Drupal CMS. Users have tones of content pages to upload ,format with images and HTML tags.
The default Ckeditor works well but I need some additional functionality to be provided to users. One of most important thing they need is HTML column format so that they can create content pages formatted as 2 column,3 column or multi column. Please see attached image from confluence editor page.
Can someone suggest me an open source editor who can format similar pages.