Some days ago I had the same question. I found several, but the one that I'm using is DbVisualizer. It is multi-platform, free, and easy to install. It also has a paid version, but the free one is enough for visualization purposes. It supports PostgreSQL, MySQL, Informix, Oracle, Microsoft SQL Server, and many other DBMS'.
PowerArchitect Community edition is free, but the really interesting features seem to go into the enterprise edition: http://www.sqlpower.ca/page/architect
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几天前我也有同样的问题。我找到了几个，但我使用的是 DbVisualizer。它是多平台、免费且易于安装的。它还有付费版本，但免费版本足以用于可视化目的。它支持 PostgreSQL、MySQL、Informix、Oracle、Microsoft SQL Server 和许多其他 DBMS。
这是下载链接
Some days ago I had the same question. I found several, but the one that I'm using is DbVisualizer. It is multi-platform, free, and easy to install. It also has a paid version, but the free one is enough for visualization purposes. It supports PostgreSQL, MySQL, Informix, Oracle, Microsoft SQL Server, and many other DBMS'.
Here is the download link
DbWrench 不是免费的（但也不贵），而且非常好：http://www.dbwrench.com/
PowerArchitect 社区版是免费的，但真正有趣的功能似乎在企业版中：http://www.sqlpower.ca/page/architect" rel="nofollow">http://www.sqlpower.ca/page/architect sqlpower.ca/page/architect
两者都是基于 Java 的并且可以在 Mac 上运行
DbWrench is not free (but not expensive either) and quite good: http://www.dbwrench.com/
PowerArchitect Community edition is free, but the really interesting features seem to go into the enterprise edition: http://www.sqlpower.ca/page/architect
Both are Java based and work on the Mac
Aqua Data Studio 提供 ER 图表生成器和 ER 建模器，但现在价格昂贵。
为合格开源开发人员提供免费许可证；减少合格学术用户的许可。
Aqua Data Studio offers an ER diagram generator and ER modeler but it's pricey now.
Free licenses for qualified open source developers; reduced licenses for qualified academic users.
已接受答案的链接不再有效。
这是一个可以接受的免费工具，可以生成图表：http://www.dbvis.com/
The accepted answer's link doesn't work any more.
Here is an acceptable tool that's free and produces graphic diagrams: http://www.dbvis.com/