Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
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.
Magic Spreadsheet - Human workforce and AI plugged into your Google Spreadsheets
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.
Spreadsheet.com - Spreadsheets that come alive as applications
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.