Go (golang) library for reading and writing XLSX files
An R package to create styled tables in multiple output formats
C++ library for creating XLSX files for MS Excel 2007 and above.
csv2odf can convert csv data to formatted spreadsheets and documents.
C library for reading/writing values from/to Excel .xlsx files.
Multi platform library to read and write schedule data
Extract data in CSV format from PDFs
The Excel add-in for creating LaTeX tables
Small, powerful, full featured WYSIWYG editor
Query Abstraction Layer
Open source Extract Transform Load engine written in Java