29. Google Fonts Font Awesome Genericons Material icons
Webフォントやアイコンフォントもおすすめ
https://www.google.com/fonts
http://fortawesome.github.io/Font-Awesome/
http://genericons.com/
https://www.google.com/design/icons/
CC-BY licenseGPLSIL OFL 1.1/MIT/CC BY 3.0SIL Open Font Licenseなど