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Mobile apps
Flat
iOS 7 Style - Metro UI Icons
Opera, Metroui
Crimson
512x512
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Desktop apps
Simply 8-bits #8
Opera
96x96
Squareplex
Files & folders
Minimalism
UI
Metro UI Icon Set
Mixed
Smooth
Addictive Flavour
48x48
3D
Web browsers
Browser, Opera
128x128