Brick is an open-source webfont service that serves fonts in their original form for high quality rendering across all browsers.
All things fonts, font-face, and webfonts. FREE, hand-picked, high-quality, commercial-use fonts.
Fonts.com provides the biggest and best selection of high quality desktop and web fonts.
Fonts In Use is a public archive of typography indexed by typeface, format, and industry.
Hundreds of free, open-source fonts optimized for the web.
The world’s largest collection of fonts for print, products & screens.
Typekit is a subscription font service that brings thousands of fonts from foundry partners into one library for quick browsing, easy use on the web or on your desktop.
It's a tool to test and analyze webfonts that you intend to use in your websites or projects.