wp_links

http://wordpress.org/themes/

https://wordpress.org/plugins/

http://codex.wordpress.org/Function_Reference

https://developer.wordpress.org/reference/

http://premium.wpmudev.org/

wp-themes

http://andreasviklund.com/

http://www.freewordpressthemes4u.com/

http://www.wpzoom.com/

http://wpthemes.info/

http://digitalnature.ro/projects/fusion/

wp-plugins

http://lesterchan.net/wordpress/category/plugins/

WordPress Plugins Used On The Michel Fortin Blog

wp-functions , classes

http://phpcrossref.com/xref/wordpress/