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Avatars & smileys
Glyph
Human Movement
gandhi, good, monkey
Black
512x512
pose, Behaviour, good
Business & finance
Free Misc Icon Set 1
good, Check, ok
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Math & Business
creative, sign, true
506x512
Mixed
Handdrawn
Social Messaging & Productivity
yes, ok, tick
star, Like, good
UI
Very Basic. Android L (Lollipop)
done, check mark, good
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Social media
Jolly Icons Free – 36 Hand-Drawn UI Icons
Agree, Up, hand drawn
64x64
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Mobile apps
Free Retina Icon Set
ok, Face, pleasure
60x60
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Photography & graphic design
3D
32x32 Free Design Icons
yes, mark, Apply
32x32
Signs & symbols
Free 3d Glossy Interface Icon Set
Accept, ready, tick
Desktop apps
Free Applications Icons
ok, success, Accept
24x24
Check, Accept, green
Crystal Clear
ok, good, yes
128x128