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Web UI
Gear, preferences, settings
DarkSlateGray
512x512
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Network & communications
Glyph
Cloud Computing
customize, Gear, Cloud
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Mixed
Flat
Things
configuration, Control, settings
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UI
Blogger
preferences
42x43
Outline
Internet and web
settings, technology, tools
settings, Change, Options
Business & finance
FatiCons
Options, preferences, settings
Computer & hardware
Ballicons (free)
Parameters, settings, preferences
128x128
Linecons Free – Vector Icons Pack
Setting, settings, params
Desktop apps
Appicns
appicns, preferences, system
513x513
Smooth
iOS 7-inspired Mac icon set
preferences, settings
1024x1024
Social media
The Circle Icons
preferences, system
Files & folders
NetNewsWire 2
Browsing, preferences
32x32
preferences, weblogeditor
3D
Exempli Gratia
256x256
Photorealistic
Duesseldorf
settings, preferences
Pixel
Boolean
16x16
Gnome Web Icons
48, preferences, Desktop
48x48
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Desktop, Gnome, 64
64x64
Humility
settings, Build, Control
Micro
radar, Nearby, system
Ciceronian
59x60
Austerity