Google Sheets - Synchronizing, online-based word processor, part of Google Drive.
XML Copy Editor - XML Copy Editor is a fast, free, validating XML editor.
LibreOffice - Calc - LibreOffice Calc is the spreadsheet program you've always needed. A fork of OpenOffice.
Oxygen XML Editor - Oxygen XML Editor provides a comprehensive suite of XML authoring and development tools.
Microsoft Office Excel - Microsoft Office Excel is a commercial spreadsheet application.
Liquid Studio - XML Tools Provider: XML Studio - Graphical XML Schema Editor.