Bootstrap Icons - Official open source SVG icon library for Bootstrap
IconStore - Free icon packs by first-class designers
Glyphicons - GLYPHICONS is a library of precisely prepared monochromatic icons and symbols, created with an emphasis to simplicity and easy orientation.
Feather Icons - Simply beautiful open source icons
Iconjar - Store all your icons in one place, just a click away
Flaticon - A database of free vector icons.