API Connector by Mixed Analytics - Connect any API to Google Sheets.
PSPDFKit API - Simplify how you process documents with a powerful and secure PDF API.
SheetHub - SheetHub turns your spreadsheets (either Google Sheets or Excel Online) into a REST-ful JSON API.
RapidAPI - API marketplace for finding and connecting to the world's top APIs.
Hoss - Track and manage third-party APIs
Smallpdf - PDF document management and conversion suite