Google Sheets - Synchronizing, online-based word processor, part of Google Drive.
Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
LibreOffice - Calc - LibreOffice Calc is the spreadsheet program you've always needed. A fork of OpenOffice.
restdb.io - restdb.io lets you create databases and REST APIs quickly. Development databases are free. Powerful web-based and mobile-friendly data management.
Microsoft Office Excel - Microsoft Office Excel is a commercial spreadsheet application.
RemoteStorage - An open protocol for per-user storage OWN YOUR DATA