DaFont is an archive of free downloadable fonts. You can browse by alphabetical listing, by style, by author or by popularity.
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 helps you find free fonts with similar features to the most famous typefaces.
Fonts In Use is a public archive of typography indexed by typeface, format, industry, and period. Perfect for inspiration and font selection.