7 Principles of Icon Design

https://uxdesign.cc/7-principles-of-icon-design-e7187539e4a2

Fontawsome

https://fontawesome.com/

Need Free Icons? Here are 13 Websites to Download Them

http://inspirationfeed.com/resources/tools/need-free-icons-here-are-13-websites-to-download-them/

Material Design Icons

https://github.com/google/material-design-icons/releases/tag/1.0.0

Material Design Icons

https://github.com/google/material-design-icons/releases/tag/1.0.0

Freepik: Free eCommerce icons

http://www.woothemes.com/2013/06/freepik-free-ecommerce-icons/

LINGUA ICON DESIGNER

http://linguadigitalis.com/#/myfaves-generator

Symbols - The best tool for accessing special characters on the iPhone and iPad

http://symbols.khanov.com/

Origins of Common UI Symbols

http://visual.ly/origins-common-ui-symbols

Ligature kudakurage Symbols

http://kudakurage.com/ligature_symbols/

Why Icon Fonts Are Awesome

http://www.leemunroe.com/icon-fonts/

Custom Icons Fitted for Website Layouts

http://www.designtickle.com/2012/05/custom-icons-fitted-website-layouts/

Icon Design in 5 Steps

http://abduzeedo.com/icon-design-5-steps-free-icon-set-ramotion

THE MAKING OF FRAMEOGRAPHER

http://www.therussiansusedapencil.com/post/20069271435/the-making-of-frameographer

500+ Free Photoshop Custom Shapes To Use In Your Web Projects

http://designbeep.com/2012/03/20/500-free-photoshop-custom-shapes-to-use-in-your-web-projects/

We need a standard show navigation icon for responsive web design

http://www.stuffandnonsense.co.uk/blog/about/we_need_a_standard_show_navigation_icon_for_responsive_web_design

the Icon Handbook

http://blog.thenounproject.com/post/17556534725/insights-on-symbol-design-by-jon-hicks

Google Plus Interface Icons

http://www.webdesignshock.com/google-plus-interface-icons/

Freebie: Free Vector Web Icons (91 Icons)

http://www.smashingmagazine.com/2011/12/29/freebie-free-vector-web-icons-91-icons/

25+ Beautiful Minimalist Icon Sets for your Windows Phone 7 App!

http://microsoftfeed.com/2010/25-beautiful-minimalist-icon-sets-for-your-windows-phone-7-app/