Here's a JAVA Applet that performs a Monte Carlo Simulation to estimate PI...
http://polymer.bu.edu/java/java/montepi/montepiapplet.html
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Gnumeric promises to be compatible with Excel and exceed it for statistical analyses.
http://projects.gnome.org/gnumeric/
Includes support for Monte Carlo analysis
Welcome to Gnumeric!
The Gnumeric spreadsheet is part of the GNOME desktop environment: a project to create a free, user friendly desktop environment.
The goal of Gnumeric is to be the best possible spreadsheet. We are not attempting to clone existing applications. However, Gnumeric can read files saved with other spreadsheets and we offer a customizable feel that attempts to minimize the costs of transition.
Gnumeric is...
Free!Gnumeric and its source code are available free of charge, licensed under the terms of the GNU General Public License. This makes it easy to audit, and make custom extensions.Fast!Gnumeric handles large spreadsheets while remaining responsive.Accurate!A spreadsheet should calculate the right answer. Gnumeric's built-in functions and tools are accurate. A report praised Gnumeric as more accurate than leading proprietary spreadsheets.
For a comprehensive list of features, go here.
News
February 2011: Gnumeric 1.10.13 is out. This is a stable release. Get it from here! We have a Win32 build of that. (Sources in the same directory except for parts found on this site. Note, however, that recompilation is very difficult.)