Iconic icons: Celebrating design’s nifty little helpers
Solid vs Outline » Welches Icon ist besser zu erkennen?
Hollow Icon vs. Solid Icon: Which Is More Friendly for Recognizing? | by Trista liu | Medium
Solid Vs. Outline Icons: Which Are Faster to Recognize?
Master's Paper | Filled-in vs. Outline Icons: The Impact of Icon Style on Usability
Solid vs. Outline Icons: Which Are Faster to Recognize?
gui design - Can solid and hollow icons be used together? - User Experience Stack Exchange
UI cheat sheet: Icon categories + icon style reference guide | by Tess Gadd | UX Collective
Accessible Icon Links
by Kitty Giraudel
a11y
Accessible Icon Buttons — Sara Soueidan – Freelance-Front-End UI/UX Developer
Icons: avoid temptation and start with user needs - NHS Digital
Solid Vs. Outline Icons: Which Are Faster to Recognize?
Generating multi-brand multi-platform icons with Sketch and a Node.js script
Redesigning the Office App Icons to Embrace a New World of Work
BoxIcons : Premium web friendly icons
Iconjar
Organize, search and use icons the easy way. Iconjar gives you the ability to store all your icons in one place, just one click away.
Material icons - Google Design
Build beautiful, usable products faster. Material Design is an adaptable system—backed by open-source code—that helps teams build high quality digital experiences.
Fontello
icon fonts generator
About those vector icons · Pushing Pixels
Font-Embedding Icons the Right Way
… A Legitimate Alternative to Images
Apple OS X Lion Buttons in CSS
Add icons to sidebar of categories and pages
Easy add icons to sidebar of categories and pages. All features are flexible and ajax based.
Plastique Icons Full Set
is a set of 434 (and growing) web and application icons inspired by advertising clip art of the 1920′s and 1930′s. The set is available in vector format and also includes a CSS/PNG sprite version. → GPL Licensed Version (download) : http://iconify.it/?file_id=9
Free Classic Clip Art Icons
Freebies Booth
Free design resources layered PSD, resizable vectors, PNG icons
IconToucan - Mix and Match Hundreds of Free Web Icons
A resource containing hundreds of web icons, for use on personal and commercial websites through a drag and drop interface.
10 Free Icons Set for your Website
iconSweets 2
… a huge FREE icon set containing over a 1,000+ icons, all in a vector-shaped Photoshop format.
free ui set from medialoot
… and a preview of what’s to come
… free icons: ultimate resource list