WordPress is probably the most popular free software solution for publishing and managing a dynamic personal Web site. WordPress widgets are a great way to add dynamic functionality to a web site. They offer the benefit of allowing the site administrator to place them in dynamic content areas of the theme and are well isolated when using the WP_Widget class.
AJAX stands for Asynchronous JavaScript and XML. AJAX can enhance your site by adding on the fly updating functionality. Below I have listed out some of the best free AJAX widgets for WordPress. Each of the plugins performs specific functions without a need to refresh the page. Widgets are basically designed to give flexibility to user to use and customize wordpress easily like plugins.
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1. Rating-Widget

2. Contact Form 7

3. SH Slideshow

4. IvyCat AJAX Testimonials

5. WPtouch

6. Clean and Simple Contact Form

7. WP-Ajaxify-Comments

8. SearchAutocomplete

9. WP Ajax Edit Comments

10. Dave’s WordPress Live Search

11. WordPress Font Size

12. WP Lightbox 2

13. Simple Page Ordering

14. Link Library

15. Ajax Content Renderer
