MonteCarlito is a free Excel-add-in (Windows and OS X) to do Monte-Carlo-simulations. It features statistical analysis of simulation runs (mean, median, standard error, and skewness), histograms, direct output to an Excel spreadsheet, and a high-speed simulation mode with minimized windows.
Mariner Calc is a powerful, yet streamlined spreadsheet software solution. It starts very quickly, and consumes very little disk space and memory. It supports many international scripts, supports spreadsheets that are up to 32,000 rows by 32,000 columns, and includes graphics and drawing tools.
CleanSheets is a spreadsheet application that is both extensible and platform-independent. It features a formula language that closely resembles that of Microsoft Excel, and extensions for aiding end-user programmers in developing correct spreadsheets. The application is written in Java, and relies on ANTLR for generating the formula compiler and the JFC/Swing JTable component for spreadsheet visualization.
phpWebSheet is a Web-based spreadsheet application that stores data in a CSV file. It features a one step undo function, support for cell functions like =A1+A2 or =sum(E1:E8), Wiki-like text-styles (headings, bold, italics), cell borders, clipboard integration, insertion, deletion, and shifting of cells.
Admelix is a live CD distribution based on Ubuntu Linux with tools for business administration. Its main objective is to guide managers of small and medium-size businesses towards GNU/Linux and open source software. In addition to the live CD, the project's Web site provides information about open and free tools for business administration.
Keyword Market Value Analyzer is a tool that allows you to compile a database of keywords, based on a particular keyword subject, and compare their real market values. The analyzer compares the number of times a keyword is searched for with the amount advertisers are willing to pay to advertise for the keyword. The result is a really good idea about how much money-making potential there is for that particular keyword.