JDB is package of commands for manipulating flat ASCII databases from shell scripts. It is useful to process medium amounts of data (with very little data, you'd do it by hand; with megabytes, you might want a real database). It is very good at doing things like managing data for research experiments. By storing data in simple text files and processing it with pipelines, it is easy to experiment (in the shell) and look at the output.
Release Notes: A fix to handle the case where there are more n-tiles than data, a new -S option to optimize work on pre-sorted data, a better estimate of memory usage when run on data with very short records, and better cleanup of temporary files.
Release Notes: First freshmeat announcement; works with Perl 5.6.