Google Fonts is the world’s best Web Font service. Offering an intuitive and robust collection of open source designer web fonts. By using their extensive catalog, you can share and integrate typography into any design project seamlessly—no matter where you are in the world.
Font Squirrel offers hand-selected typefaces, fonts and webfonts that 100% free to use, presented in an easy-to-use format.
Alternatype helps you find free fonts with similar features to the most famous typefaces.
DaFont is an archive of free downloadable fonts. You can browse by alphabetical listing, by style, by author or by popularity.