What are some alternatives?
When comparing Typekit and Open Font Library, you can also consider the following products
Google Fonts - Making the web more beautiful, fast, and open through great typography
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.
Fonts.com - Fonts.com provides the biggest and best selection of high quality desktop and web fonts. Try, buy and download classics like Helvetica, Univers, Frutiger, Trade Gothic and Avenir along with popular new fonts like Soho and Neo. Find your type!
Fontspace - FAST and FREE downloads of over 37,000 fonts for personal or professional uses. Fonts for Pinterest projects, DIY wedding invitations, scrapbooking and web design
Dafont - Archive of freely downloadable fonts. Browse by alphabetical listing, by style, by author or by popularity.
Befonts - You can download the best fonts, free fonts for personal or commercial use.