[ale] ER Diagrams

[George Allen]

>
> Some free software diagram tools just draw the shapes without having any
> knowledge of what they mean, nor do they generate SQL. These include yEd,
> LucidChart, Gliffy,[13] Kivio, and Dia. DIA diagrams, however, can be
> translated with tedia2sql.
>

+1 yEd -- This is the only open source tool that I've been able to get
full adoption of at work.
It has icons for ER diagrams, but no metadata beyond 'url' and 'description'