
Description: Pencil Project is a free and open source GUI prototyping and mockup tool. It allows users to create wireframes and prototypes for software interfaces and websites quickly and easily, without programming knowledge.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: App Sketcher is a web-based tool that allows users to easily design mobile app prototypes and wireframes. It has a simple drag-and-drop interface to add UI elements like buttons, menus, and input fields. Key features include export options to PNG, PDF, HTML, and code, as well as collaboration tools to share and get feedback on designs.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API