Obi is an open source audio book production tool that produces digital talking books (DTBs) conforming to DAISY 3 (officially, the ANSI/NISO Z39.86), Accessible EPUB 3 & DAISY 2.02 standards.

Obi is easy to learn, highly accessible, and powerful navigable audio book production tool that enables anybody to produce accessible and rich DAISY/EPUB 3 content with minimal amount of training.

www.daisy.org/project/obi