
Description: GreaseKit is an open-source browser extension framework for Google Chrome and Firefox. It allows developers to build browser extensions using standard web technologies like HTML, CSS, and JavaScript.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Violentmonkey is a free and open-source browser extension that allows users to install userscripts. It works across all major browsers including Chrome, Firefox, Edge, and Safari. Userscripts allow customizing webpage behavior and content.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API