Who uses OPS and OCF?
The majority of publishers and software companies that produce reflowable digital text use OEBPS today. There are tens of thousands of OEBPS publications in use today. The transition to OPS is an automated, inexpensive and simple process. Adobe, eBook Technologies, Inc., Mobipocket (an amazon.com company) and OSoft have implemented OCF/OPS. For the latest list of implementations and tools please see http://www.idpf.org/forums.