PowerShell module to import/export Excel spreadsheets, without Excel
An automated tool to fetch data from income tax websites
Multiple Excel combiner including sheets with large data
Find and replace using Regex in Excel
C++ library for creating XLSX files for MS Excel 2007 and above.
DataFrame server for financial timeseries data
C++/C library to construct Excel .xls files in code.
A tool to convert an exported text file from one format to another.
XlsToFormula translates xls files' formulas to binaries/executables.