EtherCalc - EtherCalc is a web spreadsheet.
XLS to XML - XLS to XML is the name of a portable and cross-platform application for converting the XML file to the XLS and vice versa.
Aspose.Cells for Cloud - Aspose.Cells for Cloud is a REST based API for processing spreadsheets in the cloud.
RoxyApps Spreadsheet Conversion Tool - Converts csv, et, numbers, xls, xlsx, ods and other spreadsheet files to png, pdf, html, jpg, and other formats
Simple Spreadsheet - Simple Spreadsheet
ZAMZAR XLS to XML - ZAMZAR XLS to XML is the web based free conversion system by the ZAMZAR that support for the multiple file conversion.