
Description: Fluid UI is a user interface design and prototyping tool that allows designers and developers to quickly create interactive prototypes and high-fidelity visual designs for web and mobile apps. Its key features include a large component library, collaboration tools, animation builder, interactions editor, template library, and support for responsive design.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Balsamiq Wireframes is a rapid low-fidelity UI wireframing tool that allows designers to quickly mockup user interfaces for web and mobile apps. Its simple and intuitive drag-and-drop interface makes it easy to arrange pre-built UI components to map out the structure and layout of an app.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API