Is there a graph/diagram editing tool that can output (or even better also parse) pseudographics, that can be easily inserted into source code comments? Like this:
+---------------+
| Some Class | +---------------+
| ---------- |----------->| Another Class |
| @its_attribute| +---------------+
| @another_attr | /
+---------------+ --------/
| /
| /
+---------------+
|Something Else |
+---------------+