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Unified Modelling Language. It is designed to model a system prior to coding so all involved are aware of the relationships between entities. It's also useful as part of software documentation. – Jonathon Oct 25 '10 at 16:20

Did you ever try Umbrello? Given it is based on KDE, however is the best tool I have encountered if you do not want to go the java route. Umbrello is in the Ubuntu repository.

If you are ok with java, ArgoUML is a quite good tool, or you can see what plugins are available for eclipse.


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Sequence diagrams are not fully developed yet in ArgoUML. Many aspects are not fully implemented, or may not behave as expected. – Lucas Pottersky Oct 25 '10 at 19:58
On the other hand, Umbrello looks promising. I don't remember having tried this one. – Lucas Pottersky Oct 25 '10 at 20:17
Umbrello should be the tool for UML diagramming. However, it has so many shortcomings in practice... One example: activity labels can't be on multiple lines. – gertvdijk Jun 10 '13 at 9:36

Tried Dia?

 sudo apt-get install dia


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AFAIK, dia can only create diagrams, but does not do any automatic code generation from the diagrams, hence it is not really a UML tool. – txwikinger Oct 25 '10 at 16:09
i couldn't find a way to create sequence diagrams with Dia. is it possible at all? – Lucas Pottersky Oct 25 '10 at 19:51
@txwikinger: there is dia2code ( Install dia2code ), but I have never used it, so no idea how useful it is... – JanC Oct 30 '10 at 8:02
@JanC Nice! ` ` – Oli Oct 30 '10 at 9:33

Dia Install dia can generate code into Java, PHP, C++ and many more, but you should install Dia2code Install dia2code for generating code. I use it for creating UML and then generate the code of the classes.

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Dia is nothing more than a sketch toy. No at all advisable to anyone willing to work in modelling. – Luís de Sousa Dec 9 '14 at 7:20

Umlet Install umlet is a great, free, open-source UML tool with a simple user interface:

  • you can draw UML diagrams fast,
  • produce sequence and activity diagrams
  • export diagrams to eps, pdf, jpg, svg, and clipboard
  • share diagrams using Eclipse
  • create new, custom UML elements

and UMLet runs stand-alone or as Eclipse plug-in on Windows, OS X and Linux.

(Also, check out its sister tool PLOTlet to create chart grids.)


Its among the best and my personal favorite !

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After a longe search in desktop apps I decided to go web, now I'm using Cacoo, which allow not only uml drawing but a lot of different drawing (like network topography, general stuff, etc). It's free and allow to share with friends and concurrently editing.

Schablonen in Cacoo

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Gaphor Install gaphor is decent. It has some limitations and bugs, but it is the least annoying of UML editors out there. However, as Dia, it cannot generate code, I am just listing it in case you ever need a straight UML diagram creation tool.

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I use Papyrus, a suite developed by the Commissariat à l'Énergie Atomique in France that is today available as a plug-in to Eclipse. It is the most advanced open source modelling tool I am aware of and supports UML2 almost entirely. Broad description:

Papyrus is aiming at providing an integrated and user-consumable environment for editing any kind of EMF model and particularly supporting UML and related modeling languages such as SysML and MARTE. Papyrus provides diagram editors for EMF-based modeling languages amongst them UML 2 and SysML and the glue required for integrating these editors (GMF-based or not) with other MBD and MDSD tools.

Most importantly, Papyrus supports Model-Driven Development (MDD), being a pretty able tool to develop Domain Specific Languages. On this regard, Papyrus seems to be the only open source tool supporting the Model-Driven Architecture (MDA) pattern issued by the OMG. With a code generator such as Acceleo you end up with a full MDD stack - from which you may even create your own DSL plug-ins.

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I like yEd. It is not open-source but it is freeware and cross-platform, handling many types of diagrams and also UML.

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Visual Paradigm is a powerful commercial tool for UML. But you can use the community edition which is free (for not commercial use). The only restriction is that every hour close the program.

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protected by Tim Post May 23 '14 at 6:35

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