HttpWatch - HttpWatch: The ultimate HTTP Sniffer for Chrome, IE and iOS
Postman - The Collaboration Platform for API Development
DreamFactory - DreamFactory is an API management platform used to generate, secure, document, and extend APIs.
Insomnia REST - The most intuitive cross-platform REST API Client ð´
AWS CloudTrail - AWS CloudTrail is a web service that records AWS API calls for your account and delivers log files to you.
RESTer - A REST client for almost any web service (Firefox and Chrome extension).