Question: What is CATS?
Answer: CATS BURP (the Compact Automated Transfer System for the Big and Ugly Rendering Project) is a small utility that allows the download of rendered frames in full quality while a session is rendering (or has completed rendering).
Question: Where can I find CATS?
Question: What does CATS require?
Answer: A Java runtime environment with support for generics (ie. Oracle's Java SE version 1.7.x or later) and a visual frontend manager (like Windows, X11, etc.). A keyboard and/or mouse may also be nice to have.
For downloading you will need an internet connection as well as some storage space to place the downloaded files in.
Question: Why are the files so BIG?
Answer: The files are fetched directly from the render output storage and have not been recompressed (ie. they are still at the full original quality).
Question: Why would anyone want to download all these big files?
Answer: Usually the kind of people who are interested in downloading the raw render output are artists who would like to add additional postprocessing effects to the images before producing the final animation or still. Using the raw render output allows postprocessing without loosing any image quality because of recompressing twice.
Question: How can BURP possibly store all this data for each session? You must have insane amounts of diskspace!
Answer: Yup =)