Harald Rosenberger's Pascal (and partly C) sources implementing the Beneath-Beyond method for convex hulls in 3D and 4D, using an old version of SoS (this part of the code is written in C). Since Harald is no longer in the United States, this code is not supported at all. You are completely on your own! Take the file, uncompress and un-tar it; this will create the directories ch/, ch/ch3/, ch/ch4/, and ch/sos/, containing the sources. A good reference for the algorithm would be [E87].
File ch.sun.tar.gz contains the SUN Sparc binaries of ch3 and ch4.