Analyze Any Font: Extract, compare, and discover open alternatives for any website instantly. Extract active webfonts from any URL, inspect their weights and styles, and match against an extensive database of free alternatives in seconds.

• See also WhatTheFont Font Finder – Identify Fonts by image.
• See also MyFonts is one of the largest font marketplaces in the world, offering professional fonts for any project. Over 300,000 available fonts, and counting.
• See also Free Font Utopia. Free fonts have met their match. We know how hard it is to find quality freeware that is licensed for commercial work. We’ve done the hard work, hand-selecting these typefaces and presenting them in an easy-to-use format. [h/t for these three, Jason Herman]