Design Approval System will help streamline the process of getting designs (or photos) approved by clients.
Web Testimonials allows you to manage testimonials placed on your site.
BackWPup allows you to backup your WordPress database, files, and more.
Simple:Press Forum is a feature-rich forum plugin.
Socialize gives publishers the ability to selectively add actionable social media/social bookmarking buttons to their posts without having to edit the meta keys/values like most other plugins require.
Top 10 allows you to track daily and total visits on your blog posts and display the count as well as popular posts.
WP Glossary allows you to create your own glossary of hot-linked terms.
WP Marketplace will convert your WordPress site into a marketplace in just a few minutes.