Nyack, N.Y.

Nyack, N.Y.-based Flat World Knowledge, which launched this month, publishes free and open college textbooks online, with the option to purchase alternate formats of its content, including print and audio, and other study aids. While offering university-level course material gratis on the Web is not a newfangled idea in the higher-education realm, there are big differences from previous efforts—there’s no advertising within the text pages, nor is there a trial period with hidden fees. There isn’t even any registration required for users. Flat World Knowledge is a publishing company, not an aggregator of other publishers’ titles, says Eric Frank, co-founder and chief marketing officer.