FindIcons.com - Search through 300,000 free icons in more than 2,000 icon packs

As its name suggests, FindIcons.com is an icon search engine (single site) that  helps you find free icons. We have the largest searchable free icons database in the world (Found somewhere with more icons than us? Let us know!) and both a sophisticated search filtering and result matching system make it possible for you to get an icon you need for every design task.

The icon licenses vary, from Freeware to Freeware (non-commercial) and others. They are genrally free but the results have premium icons displayed at the end of the result from shutterstock.