Sharp Tools is a spreadsheet written in Java. It features full formula support (nested functions, auto-updating, and relative/absolute addressing), a file format compatible with other spreadsheets, printing support, undo/redo, a clipboard, sorting, data exchange with Excel, histogram generation, and a built-in help system.
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.