PNG ICO ICNS SVG MORE
Computer & hardware
Glyph
Ionicons
checkmark
Black
512x512
checkmark, Empty
PNG ICO ICNS MORE
Business & finance
Gentle Edges Icon Set
Check, checkmark
128x128
Mixed
Pittogrammi
correct, checkmark
Flat UI Icons Free
yes, Check, checkmark
Signs & symbols
3D
Free 3d Glossy Interface Icon Set
yes, mark, validation
64x64
IcoMoon
32x32
PNG MORE
UI
Crystal Office Collection
24, checkmark
24x24
Wireframe mono icons
48x48
checkmark, round
Smooth
Developer Kit
Shopping & e-commerce
Woothemes Ultimate Icon Set
yes, ok, checkmark
Crystal Clear
ok, good, yes