看看BOUML:多平台(QT)，它工作得很好，支持协作工作。

BOUML是一个免费的UML 2工具箱(正在开发中)，允许您在c++、Java、Idl、Php和Python中指定和生成代码。 BOUML运行在Unix/Linux/Solaris, MacOS X(Power PC和Intel)和Windows下。

从维基百科:

4.23之前的版本是GPL许可的自由软件。BOUML 5及以上版本是专有软件。

对于序列图，您还可以尝试Trace Modeler。它不是免费的，但它有一个很棒的界面，非常友好和高效。你可以在任何平台上使用它。

我将添加UMLet，我还没有尝试过，但已经在我的办公室选择开始做图表。 看起来很简单，图表并不性感，但就您可以绘制的图表类型而言，它似乎相当完整。似乎有很好的导出能力太(重要!)，是灵活的可以支持自定义组件)，可以作为Eclipse插件使用。

你也可以从Lucid Chart中找到uml和其他类型的图表。

In my career I often needed to draw UML diagrams and generate Java code. I found MagicDraw most appealing and I'm a happy user. I think their licensing model is fair because it allows to pay for what you need. I prefer it to other products I used in my (distant) past: ArgoUML, Poseidon, Rational Rose, Dia. Be aware that my experiences on other products are obsolete and have maybe significantly improved or changed their licensing model. Maybe you should start with an open-source tool and decide later whether to spend some bucks.

使用MagicDraw，您可以通过从代码生成图表来记录您的代码。您也可以先建模，然后生成代码。它还可以很好地与多个ide集成。

我强烈推荐BOUML。它是一个免费的UML建模应用程序，它:

is extremely fast (fastest UML tool ever created, check out benchmarks), has rock solid C++, Java, PHP and others import support, is multiplatform (Linux, Windows, other OSes), has a great SVG export support, which is important, because viewing large graphs in vector format, which scales fast in e.g. Firefox, is very convenient (you can quickly switch between "birds eye" view and class detail view), is full featured, impressively intensively developed (look at development history, it's hard to believe that such fast progress is possible). supports plugins, has modular architecture (this allows user contributions, looks like BOUML community is forming up)

相信我，没有更好的工具了。与BOUML相比，StarUML是一个弱智的海龟。ArgoUML根本不起作用。Dia是一个人机工程学^-1软件。