This topic is about all things RPP ( Raw Photo Processor ) - a "different" raw converter
home page ( but you better visit 2 communities listed below ) = www.raw-photo-processor.com/
English = groups.google.com/g/raw-photo-processor
Russian = raw-rpp.livejournal.com/
the following use @ your own risk ( content quality wise )
a free (somewhat dated though) book = blog.dehancer.com/lifelike-book/
dated review = www.jamescockroft.com/20150822/photography/digital-darktroom-software-review-rpp/