Zamzar - Free conversion online of many type of documents (images, text, video, audio...
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.
Vertopal - Vertopal is an online platform for converting computer files to a variety of file formats.
Easy XML Converter - Easy XML Converter is a the name of a free and simple XML converter that make its users able to get the XML file converted in multiple formats in addition to Excel.
Convertio - File Conversion 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