
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: Core2D is an open-source vector graphics framework for iOS, tvOS, and macOS from Apple. It provides a straightforward API for drawing 2D shapes, text and images. Its lightweight yet powerful rendering engine can handle complex scenes with ease.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API