Postman - The Collaboration Platform for API Development
AWS CloudTrail - AWS CloudTrail is a web service that records AWS API calls for your account and delivers log files to you.
DreamFactory - DreamFactory is an API management platform used to generate, secure, document, and extend APIs.
Logmatic - Logmatic is a log centralization, analytics & visualization platform to improve software & business performance.
log4net - log4net is a tool to help the programmer output log statements to a variety of output targets.
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.