ShowTable.pm, is a Perl 5 module which defines subroutines to print arrays of data in a nicely formatted listing, using one of four possible formats: simple table, boxed table, list style, and HTML-formatting (for World-Wide-Web output). See the documentation on ShowTable.pm for details on the formatting. The program "showtable" reads data in a variety of formats from a file or STDIN, optimally columnizes the data, and then feeds the array of data to the ShowTable module for display. Showtable can parse its own output as input (except for HTML). Individual or ranges of columns may be selected for display, either by name or by index. In other words, showtable is a data formatting program. Using the '-html' option, showtable can accept ASCII tablular data and format it appropriately for display through a Web-browser.