Sheety - Turn any Google sheet into an API instantly, for free. Power websites, apps, or whatever you like, all from a spreadsheet. Changes to your spreadsheet update your API in realtime. Neat
Microsoft Office Excel - Microsoft Office Excel is a commercial spreadsheet application.
Sheetsu - Turn Google Spreadsheet into API
ChartBlocks - Import data, design and share a chart in minutes. Or seconds via the API.
Dashblock - Turn any website into an API
Google Sheets - Synchronizing, online-based word processor, part of Google Drive.