"The DCS app acts as your gateway to the ultimate flight experience by combining the power of print user manuals with the rich content. The app offers the freedom to browse through all DCS World aircrafts and helicopters by reading the flight manuals. You can discover and learn each aircraft in deep details. And it's just a beginning.."
Looks like it's made by Belsimtek...trying it out myself now. I think it's only Android right now.
https://play.google.com/store/apps/details?id=com.magazine.belsim&hl=en