Grist - Grist makes it easy to transform spreadsheets into a custom database where data is truly actionable.
API List - A collective list of APIs. Build something.
Rows - The spreadsheet where teams work faster
Phantombuster - A marketplace of simple to use no-code APIs
UProc for Sheets - Boost your sales, marketing and IT tasks from Google Sheets
The Unsplash API - No-limits, do-what-you-want API for access to 200K+ HD pics.