Nucleo - Commercial vector icons and accompanying apps to manage and customize them.
Looka - Make a logo you’ll love with Looka Logo Maker.
The Noun Project - Creating, Sharing and Celebrating the World's Visual Language
Logo Dust - Free logo designs for your projects, added every week
Streamline icons - The world’s largest icon pack library - 100k icons and illustrations.
Canva Logo Maker - Create your own custom logos without having to hire a designer with Canva's impressively easy to use logo maker. Completely free, completely online.