Editing WordPress Plugins
Edit Flow
Manage a WordPress site with multiple authors, send notifications on post updates, comment on posts and pages, customize post statuses, and refine the post editor.
TinyMCE Spellcheck
Spellcheck used to be bundled with After the Deadline, before it became part of Jetpack. This plugin is a fork of that functionality to add it back to your WYSIWYG editor and can be customized for each user.
TablePress
Add or import a table from a variety of different formats, then add it to your posts and pages with the use of a shortcode. Uses Javascript for advanced functionality like sorting and pagination, which can be customized at output.
Post Forking
Create new branch of every post that you have and compare revisions, even between different authors. Then, you can merge together changes automatically. A good way to collaborate on and version control post editing.
Editorial Calendar
Manage your posts using a calendar interface. Easily drag posts from one day to another, schedule your drafts and view all of your upcoming and past posts in a full page calendar layout.
Front-end Editor
Edit your post without every having to go to the back-end. While browsing your site, this plugin will enable a small "Edit" button next to your post that will open a WYSIWYG editor inline, in the front-end of your post.