Postman - The Collaboration Platform for API Development
Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.
Insomnia REST - The most intuitive cross-platform REST API Client ð´
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
RESTer - A REST client for almost any web service (Firefox and Chrome extension).
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.