查看 FreelyDraw。 它是一款专业、易于使用的图表工具，与visio相比虽小但功能仍然齐全，值得一试。 现在它支持 Windows 和 MacOS。
Checkout FreelyDraw. It is a professional, easy to use diagramming tool, small compared to visio but still full featured, worth a try. And now it supports Windows and MacOS.
Open Office Draw 有带有粘性连接器的盒子，我觉得在我想要的时候还可以只是一个快速简单的图表，没有什么形式主义。 Argo UML 的形式稍微正确一些，但您并不总是追求形式主义。
Open office draw has boxes with sticky connectors, which I find OK at those times I want just a quick simple diagram with little formalism. Argo UML is a slightly more formally correct, but you're not always there for the formalism.
A simple domain-specific language for directed graphs. It is well documented and has cross-platform implementations. It is also suitable for generating class-diagrams, but you probably don't want to its DSL directly for it (just write a small program to generate it)
For databases I've used Fabforce DbDesigner. There's also a version with SQL-server support.
Dia 对我来说非常有用，无论是简单的绘图还是 UML。 我知道它并不完美，但它确实可以完成这项工作。 对于思维导图（哎呀它们很有用），我使用 freemind。
不要让丑陋的网站欺骗了您，它们都是很棒的软件。
Dia works great for me, both for simple drawing and for UML. I know it's not perfect but it really can do the job. For mindmaps (and heck they are useful), I use freemind.
Don´t let the ugly websites fool you, they both are great pieces of software.
Cacoo is very nice. It's a flash-based web application and is really quite like a more friendly Visio. There are about 20 sets of shapes available, from electronic circuits to office layout to UML. And even iPhone and Android UI shapes. And it's free.
It depends of what you mean by functionality. In my opinion Visio is less a drawing than a data manipulating and visualisation tool. Under the surface all elements are made of specialised calculation sheets, which allows to handle the appearance and the behaviour of the shapes. There are plainty better drawing tools, but none that has such a complexe calculating capability.
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看看 DIA
Have a look at DIA
Gliffy 看起来相当不错，而且价格便宜，有免费选项：http://www.gliffy.com
Gliffy looks pretty good and is cheap with a free option: http://www.gliffy.com
这里有许多有趣的程序：http://www.osalt.com/visio
Many interesting programs here: http://www.osalt.com/visio
查看 FreelyDraw。 它是一款专业、易于使用的图表工具，与visio相比虽小但功能仍然齐全，值得一试。 现在它支持 Windows 和 MacOS。
Checkout FreelyDraw. It is a professional, easy to use diagramming tool, small compared to visio but still full featured, worth a try. And now it supports Windows and MacOS.
Argo UML不是visio，但可以用来制作UML绘图。
Argo UML is not visio, but can be used to make UML drawings.
Open Office Draw 有带有粘性连接器的盒子，我觉得在我想要的时候还可以只是一个快速简单的图表，没有什么形式主义。 Argo UML 的形式稍微正确一些，但您并不总是追求形式主义。
Open office draw has boxes with sticky connectors, which I find OK at those times I want just a quick simple diagram with little formalism. Argo UML is a slightly more formally correct, but you're not always there for the formalism.
不同的目的，不同的方案。
生成的应用程序流程比手绘的更好。 Graphviz dot 非常适合它。 然后，您可以输入类似以下内容：
用于有向图的简单领域特定语言。 它有很好的文档记录并且具有跨平台实现。 它也适合生成类图，但您可能不希望直接为其使用 DSL（只需编写一个小程序来生成它）
对于数据库，我使用了 Fabforce DbDesigner。 还有一个支持 SQL 服务器的版本。
http://www.fabforce.net/dbdesigner4/
For different purposes, different programs.
Application flows are better generated than hand-drawn. Graphviz dot is excellent for it. You can then type something like:
A simple domain-specific language for directed graphs. It is well documented and has cross-platform implementations. It is also suitable for generating class-diagrams, but you probably don't want to its DSL directly for it (just write a small program to generate it)
For databases I've used Fabforce DbDesigner. There's also a version with SQL-server support.
http://www.fabforce.net/dbdesigner4/
StarUML 看起来不错，只是它没有任何数据库图表功能。
StarUML looks nice except it doesn't have any database diagram features.
Dia 对我来说非常有用，无论是简单的绘图还是 UML。 我知道它并不完美，但它确实可以完成这项工作。 对于思维导图（哎呀它们很有用），我使用 freemind。
不要让丑陋的网站欺骗了您，它们都是很棒的软件。
Dia works great for me, both for simple drawing and for UML. I know it's not perfect but it really can do the job. For mindmaps (and heck they are useful), I use freemind.
Don´t let the ugly websites fool you, they both are great pieces of software.
ARIS Express 是 Visio 的免费替代品。
ARIS Express is a free-of-charge alternative for Visio.
Cacoo 非常好。 它是一个基于 Flash 的 Web 应用程序，实际上很像一个更友好的 Visio。 大约有 20 组可用形状，从电子电路到办公室布局再到 UML。 甚至 iPhone 和 Android UI 形状。 而且它是免费的。
Cacoo is very nice. It's a flash-based web application and is really quite like a more friendly Visio. There are about 20 sets of shapes available, from electronic circuits to office layout to UML. And even iPhone and Android UI shapes. And it's free.
您还可以尝试 my.origramy - 这是一个免费的在线服务，用于构建图表、方案等。它基于 Flash 编辑器/查看器组件。
You can also try my.origramy - it's a free online service for building diagrams, schemes, etc. It is based on a Flash editor/viewer component.
这取决于您所说的功能是什么意思。
在我看来，Visio 与其说是一种绘图，不如说是一种数据操作和可视化工具。
在表面之下，所有元素均由专门的计算表组成，可以处理形状的外观和行为。
有明显更好的绘图工具，但没有一个具有如此复杂的计算能力。
It depends of what you mean by functionality.
In my opinion Visio is less a drawing than a data manipulating and visualisation tool.
Under the surface all elements are made of specialised calculation sheets, which allows to handle the appearance and the behaviour of the shapes.
There are plainty better drawing tools, but none that has such a complexe calculating capability.
查看 LucidChart。 它非常快速且易于使用。 他们的免费帐户有限，付费帐户也很合理。
Check out LucidChart. It's very fast and easy to use. They have a limited free account and their paid accounts are reasonable.