Postman - The Collaboration Platform for API Development
DreamFactory - DreamFactory is an API management platform used to generate, secure, document, and extend APIs.
Assertible - Assertible software provides you with a simple and quick way to monitor your web services. It comes with automated QA tools that users can utilize to test and monitor their web services on different platforms and environments.
AWS CloudTrail - AWS CloudTrail is a web service that records AWS API calls for your account and delivers log files to you.
API Fortress - API performance, accuracy, and uptime testing. Without code.
MuleSoft Anypoint Platform - Anypoint Platform is a unified, highly productive, hybrid integration platform that creates an application network of apps, data and devices with API-led connectivity.