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UI
Glyph
Google Material Design icons
settings, Applications
Black
512x512
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Network & communications
Smooth
Chatting
preferences, config, settings
iOS7 optimized
Outline
48 Bubbles
preferences, tools, Gear
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Mixed
36 Slim Icons
Gear, settings, tools
87x87
Control, monitor, system
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Octicons
settings
448x512
Streamline - Free
streamline, settings
settings, streamline
3D
Eziconic v1.0
settings, tool, tools
256x256
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Social media
Handdrawn
Jolly Icons Free – 36 Hand-Drawn UI Icons
Setting, hand drawn, preferences
64x64
Options, preferences, hand drawn
WPZOOM Developer Icon Set
settings, tools
Files & folders
Soda Red
settings, soda, red
Photography & graphic design
32x32 Free Design Icons
tools, Setting, equip
32x32
Business & finance
48x48 Free Time Icons
Cartridge, lightning, fastening
48x48
watch, Clock, history
Pixel
16x16 Free Application Icons
tools, job, production
16x16
settings, generator, Applications
reductor, work, generator
Gentle Edges Icon Set
settings, preferences, Wrench
128x128
iOS 7 icons
Iconza
Gear, wheel, settings