What are some alternatives?
When comparing FontStruct and Iconfinder, you can also consider the following products
FontForge - Free (libre) font editor for Windows, Mac OS X and GNU+Linux
Flaticon - A database of free vector icons.
FontLab VI - font creation and editing, including variable fonts and color fonts
The Noun Project - Creating, Sharing and Celebrating the World's Visual Language
BirdFont - Birdfont is a free font editor which lets you create vector graphics and export TTF, OTF, EOT and...
IcoMoon - IcoMoon is an icon management tool that is build to provide iconography.