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.
WP Flexible Map
Add Google Maps to your pages with a shortcode or template tag. Has several customizable parameters, and supports the latest static maps API with directions, multiple maps, different map types and KML imports.
Widget Logic
Use custom PHP or WordPress' built-in conditional tags in order to add logic to any widget in the admin screen. Code can be entered in a provided text box, and is automatically paired to the corresponding widget.
Social
Adds the ability to publish post content on both Facebook and Twitter with custom messages, and to pull in social mentions across these sites back into your comments form with a new template.
Drag & Drop Featured Image
Adds drag and drop functionality to the featured image metabox in WordPress. Automatically replaces the default box on your post edit screen with a drag and drop box with a built-in file browser.
Disqus Comment System
Integrate your comments from the Disqus comments service into WordPress. You can moderate and control comments from your Disqus account, and automatically sync, import or export comments that already exist in WordPress. The plugin will store your comments in your database automatically.
Helpful Information
For each page on your site, access information that can help you diagnose and fix problems. View theme information, WordPress queries, PHP included files and style and scripts that are loaded in.
Easy Watermark
Automatically add watermarks to images uploaded to WordPress using text, a custom image, or a combination of both. You can also manually add watermarks through the Media library or uploader.
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.
SSL Insecure Content Fixer
Find the common problems that WordPress has when dealing with SSL certification, especially with external plugins and themes, and automatically fix them so that the HTTPS protocol is properly used.
WP Butler
Easily jump between common WordPress actions by typing a few words in an overlay text-box. You can navigate through menus, add a new post or search through your entire site with just a few keystrokes.
White Label CMS
Make changes to the admin section that fits your brand. You can add your own logos, rearrange the menus for different users and generally alter the look and feel of the admin panels.