Google Fonts - Making the web more beautiful, fast, and open through great typography
AMP Font Viewer - Jump to Download - Download.
Font Squirrel - Font Squirrel scours the internet in search of FREE, highest-quality, designer-friendly, commercial-use fonts and presents them for easy downloading. We don't have the most, but we do have the best.
Font Manager - Simple font management for GTK+ desktop environments
Open Font Library - The mission of the Open Font Library is to promote your freedoms as it relates to the use of type.
Fonts Ninja - Try fonts discovered on websites in any design software