Are you looking for a flat icon set, then Linea Free Iconset is the choice for you. Todays freebie is a set of Free Linea Free Iconset created with a great attention to detail.
Linea Iconset is a free iconset designed by Dario Ferrando. The set is distributed under CCBY license, meaning that you can use these files both for private and commercial projects. You are however obliged to attribute the work to Dario Ferrando.
If you want more icon, you can check the Free Icons.