Feather Icons - Simply beautiful open source icons
Iconoir - A diverse and open-source library with 900+ icons
Icons8 - Free app for Mac & Windows already containing 39,800 icons. Allows to search and import icons…
Nucleo - Commercial vector icons and accompanying apps to manage and customize them.
IconStore - Free icon packs by first-class designers
Glyphish Icons: Watchkit - Watchkit version of the famous & fabulous Glyphish icon set!