Plugins PageLoader - WordPress Loading Screen and Progress Bar v4.6 PageLoader is a wildly customizable loading screen and progress bar plugin for WordPress.
Plugins DV Loading - WordPress Site Preloader Plugin v2.1 DV Loading is a WordPress site preloader plugin which allows you to create a page loading animation for your site using rich set of customization options.
Plugins Laser - Page Loading Progress Bar for WordPress v1.0.2 Laser is a lightweight and easy to use WordPress plugin to add a page load progress bar.