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I just can't find a decent (and free) one. What can I use?

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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. en.wikipedia.org/wiki/Unified_Modeling_Language – Jonathon Oct 25 '10 at 16:20
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5 Answers

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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 -luky- N. Oct 25 '10 at 19:58
On the other hand, Umbrello looks promising. I don't remember having tried this one. – Lucas -luky- N. Oct 25 '10 at 20:17
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up vote 1 down vote

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 -luky- N. Oct 25 '10 at 19:51
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@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
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up vote 1 down vote

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.

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up vote 0 down vote

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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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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