WP Editor is a plugin for WordPress that replaces the default plugin and theme editors as well as the page/post editor.
Add syntax highlighting to the HTML editor using Codemirror.js
Adds HTML tab to the post editor which shows the raw source of the page and is highlighted with the Ace Editor
This plugin allows you add your own buttons to the post editor's TEXT mode toolbar.
Tab Override allows you to enter tabs into the HTML editor (not Visual) as you would in a desktop text editor.
Adds shortcodes to the post editor for all up to date Genesis themes.
This plugin add a syntax highlighted editor to WordPress Post new/edit screen with Emmet (zen coding) engine.
Displays checked categories in heirarchy on post editor.
Easily edit posts and pages directly on your WordPress front end with the XOpi™ Editor. Edit content, upload images and files, add links...
Spreadsheet of Posts is a WordPress plugin that aggregates all posts into a spreadsheet interface.
Link Vault is a WordPress plugin that adds a widget to your post editor allowing you to easily drag and drop commonly used hyperlinks.