PageLoader v4.6 - WordPress Loading Screen and Progress Bar
PageLoader is a wildly customizable loading screen and progress bar plugin for WordPress.
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.
Laser v1.0.2 - Page Loading Progress Bar for WordPress
Laser is a lightweight and easy to use WordPress plugin to add a page load progress bar.