[GENERAL] ERD on the cheap?

[Phil Glatz]

I putting together a small (10 tables) postgresgl database for a non-profit 
organization, and would like to use an entity relationship diagram 
tool.  They would like to be maintain it in the future, using a tool that 
preferably runs on a Windows client.  Are there any decent tools available 
that could do the job that are free or low-cost?  They are on a very slim 
budget.