I am looking for a UML design tool (just for design, no need for code generation).
Key features
Gliffy is a free online drawing tool which provides support for drawing UML diagrams. It is one of the most widely used online diagramming application. Features: Allows you to draw a diagram with ease.
Free UML Tool for Fast UML DiagramsUMLet is a free, open-source UML tool with a simple user interface: draw UML diagrams fast, build sequence and activity diagrams from plain text, export diagrams to eps, pdf, jpg, svg, and clipboard, share diagrams using Eclipse, and create new, custom UML elements.
Some alternatives are older, such as IDEF. Another alternative that comes to mind is something like Systems Modeling Language (SysML), which is actually an extension of and based on UML. This is also supported by IBM, and other companies that provide CASE software...
Most of the UML tools for Linux look really bad, but you could use these:
Experimental/alternatives:
ASCII flow - you can not always include images in documentation but simple text looks everywhere same, good to use in code for quick overview.
Cloudcraft - Draw AWS diagrams with Cloudcraft. Good for quick architecture diagrams.
For quick drawings and who does not scare to "code" some diagrams I also suggest to take look at this product http://yuml.me/diagram/scruffy/class/samples.
i like UMLet: http://www.umlet.com/. It's very light weight
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