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。

我最近在我的博客上做了一个调查“你使用什么UML工具?”NetBeans UML是开源的首选，而企业架构是商业的首选。

Visual Paradigm for UML或Dia是不错的选择

http://plantuml.sourceforge.net/index.html

紫罗兰色的

免费，而且非常容易使用。

为了我的简单和简短的UML工作， 我用过这个工具:

星联 - http://staruml.sourceforge.net/en/

很棒的免费UML绘图软件。

虽然最初的Star UML不再维护，但是现在有一个叫做White Star UML的分支正在积极开发。