
Description: ZenUML is an open-source UML diagramming software for Windows, Mac and Linux. It allows users to create various UML diagrams like use case, class, sequence, activity, and more. ZenUML has a simple and intuitive interface for fast diagramming.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: WebSequenceDiagrams is an online tool for easily creating UML sequence diagrams. It has a simple syntax for defining objects, messages, notes, and other sequence diagram elements. The service is free to use and diagrams can be exported as images.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API