Wordpress has TinyMCE as default content editor - use TinyMCE plugins to add new features to Wordpress content editing.
If you prefer CKEditor it is also fully supported by WP and can be easely installed into it.
Upload a picture and insert a preview to the site. Compatible with LightBox and other viewers.
Upload and insert an image preview in literally two clicks. Compatible with ShadowBox and other viewers.
Upload an image from another server by URL and insert it to the content of your own site.
Insert an icon from the most popular icon set and select and preview its custom style.
This table of special characters allows inserting symbols as text or image to the content of the site.
Insert a styled button-link to your website. Use one of the templates, or create your own design.
Automatically back up content of each of your pages to the built-in storage of a browser or to the server.