
Description: WhiteStarUML is an open-source UML modeling tool for Windows, Linux and Mac. It allows users to create UML diagrams like class, sequence, use case, state machine and activity diagrams. It has basic UML 2.0 compliance and is lightweight and easy to use.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Yakindu Statechart Tools is an open-source modeling tool for developing reactive, event-driven systems and complex business logic. It is based on statecharts and provides a graphical editor, code generators, simulation, debugging, test case generation, and documentation generation.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API