Automation frameworks built on top of Selenium WebDriver are gaining popularity for automating web browsers for various tasks such as testing, scraping, and other automation needs. These open source frameworks offer a range of features and capabilities that make it easier for developers to automate their web applications, including support for parallel testing, object-oriented programming, and integration with popular testing frameworks like JUnit and TestNG. Frameworks like JavaBELLATRIX, FluentLenium, Selenide, PythonRobot Framework, SeleniumBase, JavaScriptCodeceptJS, WebdriverIO, Nightwatch.js, Boyka Framework, Atata, Boa Constrictor offer intuitive interfaces, powerful syntaxes, and robust architectures that cater to the needs of developers with varying levels of experience. Whether you're a Java programmer or a C# developer, there's an open source automation framework that's right for you, making it easier to write effective automation scripts and automate your web applications.