Find Icons is an awesome free icon search engine which not only holds around 300,000 icons in the database, but also lets you categorise them in your own personal favourites box and convert them to different formats on the fly. It’s still a work in progress, but a great tool even so.
As its name suggests, FindIcons.com is an icon search engine helps you find free icons. It has a largest searchable free icons database in the world (Who has more icons than us? Let us know) and a sophisticated search filtering and result matching system both make it possible for you to get an icon you need in every design tasks.
iconarchive is as good~~
iconsfind.com is good