MailChimp pattern library - http://ux.mailchimp.com/patterns/navigation#

HTML5 Admin interface with Bootstrap 3 - http://www.html5admin.com/demo/ui.html

Ion Icons - http://ionicons.com/

Favicon Generator - http://realfavicongenerator.net/

Content Snippets - http://www.contentsnippets.com/

Font combinations - http://justmytype.co/, http://fontsinuse.com/, http://typewelike.wirsindsmyk.de/, http://www.typ.io/latest

#UI