WPExplorer - WPExplorer enables you to explore numerous WordPress Plugins and Themes and pick the one that matches the requirements of your company.
Themify - Premium WordPress Themes & Plugins Since 2010, Themify themes and plugins have been helping 87,941+ customers make beautifully responsive WordPress sites, faster and easier than ever.
CyberChimps - Get Free & Premium WordPress Themes & Templates - Fully Customizable, Fast & Mobile-Friendly by CyberChimps. Home of the popular Responsive WordPress Theme.
TemplateMonster - TemplateMonster offers premium website and e-commerce templates.
Graph Paper Press - Graph Paper Press is an all-in-one platform for photographers that use WordPress.
Web-Dorado - Web-Dorado offers a large number of WordPress Themes, Plugins, and Joomla Extensions that you can select for your business.