...This converter allows you to write a table in Excel instead, and export the current selection as LaTeX markup which can be pasted into an existing LaTeX document, or exported to a file and included via the \input command. Known to be compatible with Windows Excel 2000–2016 (32-bit and 64-bit) and Mac Excel 2004, 2011, and 2016. May also be compatible with other versions that support .xla add-ins. Does not work on LibreOffice Calc.
Script for OpenOffice/LibreOffice to convert tables to Latex-Code
...Its similar to Calc2Latex, but typographic formatting is more advanced (numeric columns, dcolumn-package, booktab-package)
Script is tested and working with...
... Ubuntu 12.04 64 bit / LibreOffice 3
... Windows 7 64 bit / LibreOffice 3*
... Arch Linux 64 bit / LibreOffice 4.2
*Encoding problems with special characters (non-unicode) on Windows reported.