Airbnb Official API - Develop your application for millions of travelers & hosts
API List - A collective list of APIs. Build something.
Airbnb Experiences - Airbnb expands beyond rentals — now hosting Experiences
Spinneret - Record and Automate Anything on the Web
PublicAPIs - Explore the largest API directory in the galaxy
The Unsplash API - No-limits, do-what-you-want API for access to 200K+ HD pics.