Charles is a HTTP proxy that enables you to see traffic between your machine and the backend

mabl is a low-code, intelligent test automation platform for Agile teams.

Mock and modify HTTP request for exploratory testing.

TestQuality is a cloud-based test management platform that integrates with issue and requirements trackers, automation frameworks and (CI/CD) systems. It assists your QA teams in managing and tracking software testing.

An open source Ruby library for automating tests.

Appium is an open-source project and ecosystem of related software, designed to facilitate UI automation of many app platforms