betterwp
http://betterwp.net/
Dashicons font
https://developer.wordpress.org/resource/dashicons/#welcome-write-blog
InstantShift
http://www.instantshift.com/category/wordpress/
WP Engineer
http://wpengineer.com/
Stack Exchange
http://wordpress.stackexchange.com/
WpRecipes
http://www.wprecipes.com/
Wpforce
http://wpforce.com/
wpexplorer
http://www.wpexplorer.com/blog/
wpbeginner
http://www.wpbeginner.com/
WP Theming
http://wptheming.com/