Use Case diagrams are used to identify the primary elements and processes that form the system. They are also great storyboard tools for user meetings. They define the requirements of the system being modeled and hence are used to write test scripts for the modelled system.
A unified modeling language (UML) diagram depicts a system and how users or other systems interact with yours—a system could be a website, an app, or maybe a business process. There are many tools available in the market for designing UML diagrams. Unified-Modeling-Language specifies 14 diagram types that represent the structure, behaviour, and interactions of a system. To work with this language, you need the right tool: UML tools are modeling tools that can do much more than simple drawing tools. These programs do not only provide standardized UML shapes, which can be provided with corresponding arrows and labels. They are often platform-independent and export your UML diagrams in various formats. With some, you can also import code and display it as a diagram – or export diagrams as a code template. Other tools allow you to specify UML independently to create profiles that fit your project.
Visual Paradigm supports UML, ERD and Organization Chart. You can draw User Case Diagram quickly through the intuitive UML drawing editor. The free UML tool has with no ad, no limited period of access and no limitations such as, number of diagrams, number of shapes and etc. Draw UML freely. And you own the diagrams you created for personal and non-commercial purposes and with 100 of templates available.
Lucidchart offers an intuitive interface and hundreds of templates, helping your teams communicate complex systems, processes, and ideas with visuals. Elevate your perspective on every area of your business to drive sales, simplify people management, map out your infrastructure, and more.
draw.io is free tool and can easily available on the web. You don't need to download any software for this. What makes it different is apart from user case diagrams you can make wireframes in this tool. There are multiple ranges of web app icons are available which helps to make your wireframe with more deep understanding and working.
Creately provides a huge range of templates for designing UML diagrams, DFD. When it comes to drawing use case diagrams one area many struggles with is showing various relationships in use case diagrams. In fact many tend to confuse <<extend>>, <<include>> and generalization. Creately makes it easy to represent the relationship in user case diagrams.
Within GenMyModel, you can create your use case diagram online and generate images and PDF files. Everything is handled in your web-browser with an intuitive user interface. The use case diagrams conform to the UML standard. You get both a visual representation, called the diagram and the internal structure of your model in a tree-based representation. It works on Windows, Mac, Linux and the supported browsers are IE, Chrome, Firefox, Safari and Opera.