Pretty Simply Progress meter is a clean and fun way to share your tracked progress on everything!
The Scribometer allows writers to track and display their writing progress in their sidebar.
Bottom Bar is a WordPress plugin that includes a several features for creating interactive and user-friendly toolbar.
Displays recent tweets by local businesses in a sidebar. To define a geographic bounds, first get an API key
An extension for WordPress Admin Bar plugin. -- No longer in development.
This plugin adds an adminbar on the top like in WordPress.com. Screenshots on my website.