CSS Icon - CSSIcon is set made with pure css code and no dependencies.
App Icon Template - Royalty free app icon creator for iOS, OS X and Android
Type Foundry Index - Making type foundries easy to find.
Radix Icons - A crisp set of 15×15 icons. Open source.
Walls.io - Walls.io is an all-in-one social wall solution that allows you to collect, curate, and display content in an easy-to-customize feed. You can collect content from multiple social media platforms or let your audience post content directly on your wall.
Drawcon - Draw your own app icons