Plug-in for Oracle Application Express (APEX) by United Codes
United Codes Rich Text Editor Pro integrates the popular Froala WYSIWYG Editor into an awesome plug-in for APEX. This enhanced HTML/Rich Text editor takes care of the CLOB handling for you - so you don't have to worry about the 32,767 character limit! Easily handles images, is highly customizable, and supports multiple languages.
On plug-ins-pro.com you can see the documentation, sample app and ability to download.