Install two functions in Calc in the section Text to describe a integer number in spanish or english.
For examples:

=INSPANISH(15) -----> quince
=INSPANISH(13.5) ---> trece

=TOWORDS(15) -----> fifteen
=TOWORDS(13.5)---> thirteen

Instala dos funciones para Calc en la sección Texto que describen la parte entera de un número en español e ingles.
Como ejemplos:

EuroOffice Solver provides a fast algorithm to solve the linear programming problem in OpenOffice Calc. A linear programming problem consists of a set of linear inequalities on a number of real variables and a given linear function (on these real variables) which is to be maximized or minimized.

Export selected ranges of cells to formated tables in Dokuwiki syntax. Download page and description, screenshot.

BorderLiner provides a simple method to draw borders in tables and some text elements in OpenOffice.org Calc and Writer.
 

Version 2.0.3 2008-10-13
Provides six functions to insert date or time or timestamp, as text / string or field / value, in Writer / Calc,
Pre-formatted to user needs ( ISO8601 format, adjustable) with German locale strings, English format notation in source: just un-comment.

Export, Update and Import your documents to and from Google Docs, Zoho and WebDAV servers.
With OOo2GD you may export to Google Docs, Zoho and WebDAV servers:
* Documents: ODT, SXW, DOC, RTF without modification, other known to OO.org after conversion to ODT