One tool for intercepting, mocking, and replaying HTTP — acquired by BrowserStack
Requestly is an open-source HTTP interceptor, API client, and session replay tool that lets developers modify, mock, and debug network traffic without leaving the browser. Acquired by BrowserStack and trusted by 200,000+ developers, it bundles a Chrome extension, a full API client, mock servers, and shareable session captures into one free-plus-commercial product.