SplitIndex consists of a LaTeX package, splitidx, and a small program, splitindex. The package may be used to produce one index or several indices. Without using the program the number of indices is limited by the number of TeXs output streams. But using the program you may use even more than 16 indices. At this case, splitidx outputs only a single file \jobname.idx and the program splits that file into several raw index files and calls your favorite index processor for each of it. The author is Markus Kohm.