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Desktop apps
Outline
Minicons
Confirmation, Box, Alert
Black
512x512
Alert, White, warning
Attention, Box, Confirmation
warning, Alert, Dialog
Dialog, Prompt, Box
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Photography & graphic design
Flat
Flatified
blog, Comment, Alert
MediumSeaGreen
iOS7 optimized
48 Bubbles
Alert, bell, Alarm
Network & communications
Glyph
Communication & Technology
wave, Attention, Error
Mixed
Octicons
Alert
Smooth
Gradient Runded Glowing Icons
MediumAquamarine
128x128
UI
Freecns Cumulus
Clock, Alert, time
Social media
Red website beauty
red, News, announcement
IndianRed
Halloween
Photorealistic
Desktop Halloween
user, kill, Caution
256x256
Holiday, problem, warning
DarkSlateGray
Computer & hardware
Ionicons
Alert, Circled
Tango Icon Library
severe, Alert, weather
Gaming & gambling
3D
Free Game Icons
warning, Blaze, Attention
64x64
48x48 Free Object Icons
Alert, fire, combust
48x48
Business & finance
48x48 Free Time Icons
warning, medicine, siren
Abort, exclamation, Up
Tomato
anxiety, Alert, hospital
Red
warning, Alert, Hand
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Pixel
24x24 Free Pixel Icons
weapon, Caution, Bomb
24x24