icon collection
a collection of computer icons
Farm-Fresh web icons
free icon set by FatCow
Silk
Creative Commons licensed icon set
Oxygen Project
computing project for KDE 4 interface
Material Design icons
icon set by Google
Tabler-Icons
Open source icon collection from the Tabler team
Tango Desktop Project
library
Candy Icons
Free icon collection for GNOME
Font Awesome
font and icon toolkit
Feather
open source icon set
Bootstrap Icons
Icon set of the free framework Bootstrap