IcoMoon is a free service that enables us to create custom icon sets and icon fonts using different sets.

The application includes most of the popular and free icon sets (that can be selected from its library), we can choose which ones to use and select any number of items from them.

Icomoon

Once the selection is over, it offers 2 types of downloads: image and font.

The image version comes as PNG with optional sprite image + the CSS rules and the font version in multiple formats (EOT, SVG, WOFF, TTF).

Also, besides the icons of other designers, IcoMoon has its own and free icon set which is pretty huge and slick.

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