Redactor

  http://imperavi.com/redactor/license/

Benefits

• Yii 1.1 integration : http://www.yiiframework.com/extension/redactor/
• Have a plugin for image http://imperavi.com/redactor/plugins/image-manager/
• Have a plugin for files http://imperavi.com/redactor/plugins/file-manager/
• Have a plugin for placeholder : http://thezee.hu/redactor_placeholder/
• Have a plugin system

constraint

• See alert