The Palisade DecisionTools Suite (now owned by Lumivero) is a professional-grade risk and decision analysis toolkit that integrates with Microsoft Excel. While it is a premium subscription-based software, there are several ways to access it for free or at a significant discount. Free Access Options
The project is green-lit, Leo gets his promotion, and the company finally buys the full license. He learned that while you can't predict the weather, you can certainly build a better umbrella if you have the right tools.
These are modified versions of the software found on torrent sites or unauthorized third-party forums that claim to bypass the licensing server.
Palisade Corporation offers a fully functional, time-limited trial directly from their website. This is the safest and most legitimate “free download” available.