Elegant Themes - Simple, yet beautiful WordPress themes with easy to use implementation and support.
WP Rocket - WP Rocket offers a caching plugin for Wordpress.
ThemeFuse - ThemeFuse is a store that provides high-quality designed WordPress themes to let you stand apart from the crowd.
Yoast - Yoast offers plugins to improve SEO and optimize web sites and blogs.
PremiumPress - wordpress themes for business
Wordfence - Comprehensive security plugin for WordPress.