DaFont
DaFont is an archive of free downloadable fonts. You can browse by alphabetical listing, by style, by author or by popularity.
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CSSans Pro
CSSans Pro is a colorful, sassy, CSS font created by Izabela Andronache and Codrin Pavel. You can use it for free on your next project.

Alternatype
Alternatype helps you find free fonts with similar features to the most famous typefaces.

Fonts in Use
Fonts In Use is a public archive of typography indexed by typeface, format, industry, and period. Perfect for inspiration and font selection.

Font Squirrel
Font Squirrel offers hand-selected typefaces, fonts and webfonts that 100% free to use, presented in an easy-to-use format.