You can download it from here.REC Studio is an interactive decompiler.
It reads a Windows, Linux, Mac OS X or raw executable file, and attempts to produce a C-like representation of the code and data used to build the executable file.
It has been designed to read files produced for many different targets, and it has been compiled on several host systems.
REC Studio 4 is a complete rewrite of the original REC decompiler. It uses more powerful analysis techniques such as partial Single Static Assignment (SSA), allows loading Mac OS X files and supports 32 and 64 bit binaries.
Although still under development, it has reached a stage that makes it more useful than the old Rec Studio 2.
To start the GUI you must call RecStudioLinux from the command line.