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.
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.
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.