API List - A collective list of APIs. Build something.
Postman - The Collaboration Platform for API Development
Node.js on App Engine - Fully managed Node.js serverless application platform
DreamFactory - DreamFactory is an API management platform used to generate, secure, document, and extend APIs.
Dash 4 - Instant offline access to 150+ API documentation sets
AWS CloudTrail - AWS CloudTrail is a web service that records AWS API calls for your account and delivers log files to you.