Apps to Create UML entities

Diagram Designer is a free, lightweight vector graphics editor for creating various diagrams, including flowcharts, UML diagrams, illustrations, and slideshows.

Gliffy is a user-friendly, cloud-based diagramming tool that simplifies the creation of flowcharts, UML diagrams, floor plans, and other visual representations directly in your web browser.

Mindomo is a versatile online mind mapping software that helps users organize thoughts, collaborate on projects, and deliver dynamic presentations. It offers a rich set of features for brainstorming, planning, and visualizing information.

Lucidchart is a leading web-based diagramming software that empowers individuals and teams to create complex visual representations of ideas, systems, and processes. It offers extensive shape libraries, real-time collaboration features, and seamless integration with popular productivity tools, making it ideal for flowcharts, UML diagrams, wireframes, and more.