The above page describes an Analog Devices ADSP-21xx assembly language to ANSI-C translator, or reverse compiler as they call it. A windows console-mode executable can be downloaded, and the authors state that a Linux binary can be provided on request. There is also a users manual online.
The ADSP-21 is a DSP processor; these present special challenges for decompilation. Several of these have been publised in papers, three of which can be downloaded from the above page.