NUMBERTEXT and MONEYTEXT are spreadsheet functions for number to number name and currency name conversion proposed for OpenFormula standard. MONEYTEXT is functionally top-compliant with the ECMA/ISO standard BAHTTEXT function.
These functions were originally developed for OpenOffice.org and the NUMBERTEXT/MONEYTEXT development uses OOo Wiki for discussion (see the discussion page of this page).
Dedicated site: NUMBERTEXT.org
Working demo: NUMBERTEXT Calc extension
Comments and bug reports: discussion page