Freebbble!

Direct-linked is the Photoshop version. Check the Dribbble post for the Illustrator version.

Replacement Icons for Photoshop and Illustrator is a free Icon design resource made by Dribbble user Adam Tolman. As far as I can tell, its license is Unknown.

Helpful hint: Dribbble users are nice. If the license is unknown, it is usually because they forgot to mention it explicitly; not because they were being stingy. Ask nicely and they will probably allow you to use it.