What are some alternatives?
When comparing Font Awesome and Iconfinder, you can also consider the following products
Flaticon - A database of free vector icons.
Google Fonts - Making the web more beautiful, fast, and open through great typography
IcoMoon - IcoMoon is an icon management tool that is build to provide iconography.
The Noun Project - Creating, Sharing and Celebrating the World's Visual Language
IconPharm - IconPharm is a library of open source icons with recoloring and resizing tools.
IconArchive - Search through more than 735,000 free icons. Browse icons by category, artist, popularity, date. Organize and share your favorites.