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Mixed
Glyph
Material Core
Circle, Check
Black
512x512
Check, Circle
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Check
Files & folders
AwesomeFolders
Folder, Check, exclamation
UI
Outline
Feather
Check, square
Social media
Smooth
Icocentre Free Icons
done, Check, ok
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Photography & graphic design
Flat
Flatified
technology, monitor, Check
todo, done, memo
Geomicons
Network & communications
Communication & Technology
ok, speech bubble, Bubble
Arrows
Slim Square Icons - Basics
check mark, Check
Octicons
384x512
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Handdrawn
Jolly Icons Free – 36 Hand-Drawn UI Icons
to-do, todo, Checklist
64x64
Travel & hotels
Meanicons
meanicons, ok, okay
buy, store, Add
3D
32x32 Free Design Icons
yes, mark, Apply
32x32
Boxes, Check
mark, checking, spell
AIGA Symbol Signs
hanger, Check, Coat
Business & finance
Gentle Edges Icon Set
Check, checkmark
128x128
Windows Metro
48x48
Flat UI Icons Free
yes, Check, checkmark
Check, Accept, yes