
Description: Violet is an open-source UML editing tool for Windows, Linux and Mac that allows users to create a variety of UML diagrams like use case diagrams, class diagrams, sequence diagrams, communication diagrams, statechart diagrams, activity diagrams, etc. It has a simple and intuitive graphical interface.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: System Designer is a visual modeling and design tool for creating software system architectures. It allows users to model systems using various UML diagrams like use case, class, sequence, and activity diagrams.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API