StatTool is a project mainly written in Java, it's free.
StatTool is a command-line Java tool for basic statistical analysis. Given one or two sets of data, it will display some useful statistical information about the data.
StatTool copyright (c) 2011 Eli Spiro. Made available under the GNU General Public License v3.0, giving you the legal permission to copy, distribute, and/or modify it, but with the restriction that you maintain the same freedoms when you re-distribute. For more information about the license, visit http://gnu.org/licenses/gpl.html