Iconscout has recently released Unicons, a very complete set of 1000+ free vector icons. Icons are available in top categories (for example, User Interface, Business, Shopping, Medical) and they are carefully crafted in 24px grid to have consistency on all kind of display.
Icons are available in SVG files. Frontend developers can use them as webfont including a CSS file in the head section of a web page.
Download Unicons