Postman - The Collaboration Platform for API Development
PDFhub - PDFhub offers a comprehensive range of PDF-related conversion services including editing, content extraction, etc all in a fast, reliable, and secure manner.
DataEquity.io - DataEquity: The API Platform for API Governance
RapidAPI - API marketplace for finding and connecting to the world's top APIs.
Smallpdf - PDF document management and conversion suite
Callcounter.eu - Callcounter gathers API usage data and gives you insight in trends, slow parts and errors.