Open Air Publishing
http://www.openairpublishing.com/High quality, original, interactive how-to books for iPads. A better way to learn
Open Air Publishing produces original, how-to e-books designed exclusively for touchscreen devices like the iPad and iPhone. Its books allow readers to master new skills through touch, sight, and sound, guided by our extensive network of experts. Each title in its growing library is crafted to provide a high-quality, comprehensive experience that enhances the depth of a traditional book with premium multimedia elements. Open Air Publishing was founded in May 2011 and is based in New York City.
Angel list: https://angel.co/company/open-air-publishing
Total raised: $970K