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UI
Glyph
Very Basic. Android L (Lollipop)
electricity, Light bulb, Idea
Black
512x512
Social media
Flat
Logotypes
Kickstarter, Crowdfunding, ideas
Mixed
Icons Solid
Idea
Education & science
Outline
Hand drawn Academic
Energy, light, power
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Pixel
8-Bit
electricity, charge, Bit
Computer & hardware
Line icons for UI & more
crowdfounding, Genius, lamp
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Handdrawn
Jolly Icons Free – 36 Hand-Drawn UI Icons
hand-drawn, weather, hand drawn
64x64
WPZOOM Developer Icon Set
Idea, bulb, light
Linecons Free – Vector Icons Pack
light, Idea, bulb
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Mobile apps
Free Retina Icon Set
brightness, Source, day
60x60
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Business & finance
48x48 Free Time Icons
Strike, Idea, light
48x48
iOS 7 icons
3D
E-commerce & business icons
256x256
Mimi Glyphs
Idea, light
16x16
Avatars & smileys
Smooth
Buttery
Idea, Have, no
128x128
Photography & graphic design
This is Art 2
webdesign, tips, Idea
Black ToolBar Icons
Idea, lamp, light
40x40
Desktop apps
16x16 Free Toolbar Icons
lamp, light, question
IconSweets 2
light, Idea, Buld
Idea, Buld, Black & white
Pretty Office Icon Set Part 6
Idea, intercommunication, commerce
Web Cartoon
Light bulb, Idea
Sabre
Idea, Folder
Gnome Web Icons
bulb, Idea, light