To save time those eager to try existing programs handling DOT graphs:
dotty can display DOT graphs and with little luck you can move its nodes with a mouse, nothing more, and you can easily segfault as a bonus (I tried latest stable graphviz)
lefty is only a special-purpose language interpreter used by dotty, nothing to look at
KGraphEditor is an empty wishful project (a QT window and a few buttons)
gvedit is not really a graph editor: it provides a simple text editor and you hit F5 to run a layout tool and open a picture; you can actually get more functionality from configuring your own favourite text editor
grappa is an abandoned java applet, which I failed to run
interestingly, dia can export to DOT ("PyDia DOT Export"), but due to its buggy printing, you have to post-process the files to use them
graphedit can read in DOT a graph and you can move its nodes around and change their colors
Eclipse people started working on DOT support in GEF4, so it can display DOT graphs
GraphUI has a very interesting demonstration video, but beware: although it might seem that the graph is being created by clicking and dragging, in reality all editing happens through the keyboard, using shortcuts. On the plus side, contextual instructions are always available showing which shortcuts do what.
DotEditor claims a tree editor, modifying node attributes/color/shape with mouse.
The graph editors mentioned in other answers, yEd (a Java application) and JointJS/Rappid (a JaveScript thing) apparently have nothing to do with DOT (tried both).
I believe there exist no working DOT-handling graph editor out there at all.
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为了节省那些渴望尝试处理 DOT 图形的现有程序的人的时间：
其他答案中提到的图形编辑器，yEd（一个 Java 应用程序）和 JointJS/Rappid（一个 JaveScript 东西）显然与 DOT 无关（都尝试过）。
我相信根本不存在可用的点处理图形编辑器。
To save time those eager to try existing programs handling DOT graphs:
The graph editors mentioned in other answers, yEd (a Java application) and JointJS/Rappid (a JaveScript thing) apparently have nothing to do with DOT (tried both).
I believe there exist no working DOT-handling graph editor out there at all.
JointJS 是一个基于 Backbone 的 Javascript 图形编辑库：http://www.jointjs.com/
作者还提供了 Rappid，一个可能适合您需求的在线图形编辑器，但我不知道点文件导入。
JointJS is a Javascript graph editing library based on Backbone : http://www.jointjs.com/
The author also provides Rappid, an online graph editor which might suit your needs, I don't know about dot files import though.