Rocket Theme provides premium professional themes and templates for Open Source Platforms, including Joomla!, WordPress, Drupal, Magento and more
Elegant Themes focuses on providing a reduced, high-quality set of WordPress themes supported directly by the author
Template Monster is one of the largest and more established theme and template sites and supports Joomla!, WordPress, Drupal and Magento.
Over 5.000 themes, starting from $1 Support for Joomla!, WordPress, Drupal and Magento.
WooThemes provides over 100 high-quality WordPress themes for all types of web publishers, featuring stunning design and incredible support.
WPMU provides themes and plugins for WordPress and WordPress Multi User, including a set of freely available ones.
SugarOutfitters specializes in SugarCRM add-ons. Every single solution goes through extensive testing before being accepted. Because of this, they provide you only with high quality solutions backed by their 30-day guarantee.