Software and hardware systems contain faults. One important technique to detect faults is testing. With the spread of model-based development, models became also important for testing. In model-based testing, test models are used to generate test suites (semi-)automatically.
UModel is a UML (Unified Modeling Language) software modeling tool from Altova, the creator of XMLSpy. UModel supports all 14 UML 2 diagram types and adds a unique diagram for modeling XML Schemas in UML.
Visual Paradigmand
StarUML
Online flowchart maker: Sankey Flow Show is a modern online web application running in your browser. It focuses on high graphical quality and user efficiency. Highlights: Revision history, live collaboration, customizable data forms...
Lucidchart
Free sequence diagram online generator. The tool allows you to create sequence diagram online easily and quickly, using simple text.
SequenceDiagram.org
draw.ioand
Excalidraw
Astah Professional is an all-in-one modeling tool for software design, supporting UML, ER, DFD, flowcharts, and more. It offers code generation, reverse engineering, collaboration features, and extensibility via plug-ins and scripts.
Visual ParadigmandStarUML
Flowdia is an easy to use flow diagram tool that can be used to quickly create professional quality Flow Charts, BPMN 2.0 diagrams, Network Layouts, UML Activity and Class diagrams.
DoodleBoard is an online whiteboard application, with build doodle style rendering effect and many hand-craft doodle shapes. It can be used for your visual thinking, note-taking and presentations.
A simple way of describing graphs and include it easily in your web for free, blog, markdown page, github, and any location where remote images can be showed.
Diagramiq is an online app for creating Flowcharts, UML, BPMN, Network Diagrams, Decision Trees and more. It's blazing fast, intuitive and it has a wide-range of predefined shapes to get you started.
