PNG SVG MORE
Social media
Smooth
Icocentre Free Icons
done, Check, ok
Black
512x512
PNG ICO ICNS SVG MORE
UI
Snipicons
ok
ok, Circle
PNG ICO ICNS MORE
Computer & hardware
Blue Bits Basic and Bonus
ok, yes, Check
256x256
Email, Check, ok
profile, ok, Check
Mixed
Bunch of Bluish Icons
Humility
Apply, Check, ok
48x48
Ultimate Gnome
ok, Dialog
Desktop apps
3D Cartoons III
ok, Check, selected
128x128
Shopping & e-commerce
Woothemes Ultimate Icon Set
yes, ok, checkmark
Crystal Project
Clean, yes, correct
Futurosoft
ok, Adept, notifier
32x32
KDE Crystal Diamond
ok, button
22x22