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SEO & web
Flat
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SkyBlue
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Photography & graphic design
Flatified
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Black
Network & communications
Glyph
Communication & Technology
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Social media
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UI
Windows 8 metro style
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DarkSlateGray
Business & finance
FatiCons
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Handdrawn
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Red website beauty
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IndianRed
Education & science
Brainy Icons Free — 36 Science and Education Icons
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Avatars & smileys
Jolly Icons — Part 1: Social Media and Communication
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Mixed
Outline
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Email, send, mail
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WhiteSmoke
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Farm-fresh
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Computer & hardware
Crystal Project
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Shiny Icon Set
send, mail, envelope
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