The available files are:

Riemann1.ms   - Tutorial worksheet with general explanations.

Riemann2.ms   - Worksheet showing the calculation of the geometrical
                quantities of the Schwarzschild metric in coordinate basis.

Riemann3.ms   - Worksheet with calculations in Kerr metric
                using null tetrads.

Riemann       - The code of the package in ascii. (press shift key before clicking)

maple.hdb     - The help file  (see Riemann.zip of Riemann.tar.gz)

Riemann.zip   - All previous files (zipped - zip or pkzip).

Riemann.tar.gz - All previous text files (compressed by gzip).