FlaUI enables reliable end‑to‑end UI automation for Windows applications, offering a clean .NET interface over Microsoft’s UI Automation APIs (UIA2/UIA3) to test Win32, WinForms, WPF, and UWP apps.

Puppeteer is a Node.js library which provides a high-level API to control Chrome/Chromium over the DevTools Protocol.

Robot Framework is a generic open source automation framework. It can be used for test automation and robotic process automation (RPA).

Jest is a delightful JavaScript Testing Framework with a focus on simplicity.

Katalon's AI-augmented platform enables efficient test writing, deeper insights, and enhanced coverage. It achieves faster execution, higher accuracy, and improved test coverage, ensuring high-quality software products.

Mockoon is the easiest and quickest way to design and run mock REST APIs.