Oracle ER diagram tool


are there any OpenSource or Freeware tools to generate an ER diagram from an existing database.
It should support at least Oracle (10.x) and possibly other databases as well.

I know the commercial tools (Toad, ER/Studio, etc.), but I need a free or OpenSource tool.

Thanks in advance!

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Dr_BillyConnect With a Mentor Commented:
sventhanConnect With a Mentor Commented:
Try keeptool from below... 
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