# FREE Entity Relationship Diagram Software

**URL:** <https://www.ruby-forum.com/t/free-entity-relationship-diagram-software/139777>\
**Category:** Rails\
**Created:** [June 6, 2008, 10:05pm UTC](https://www.ruby-forum.com/t/free-entity-relationship-diagram-software/139777 "2008-06-06T22:05:33Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![ror\_arch](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/e19adc/32.png) [@ror\_arch](https://www.ruby-forum.com/u/ror_arch)\
**Post date:** [June 6, 2008, 10:05pm UTC](https://www.ruby-forum.com/t/free-entity-relationship-diagram-software/139777/1 "2008-06-06T22:05:33Z")

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Does anyone know of a free entity relationship diagram software?

My pencil and paper diagrams are getting rather elaborate and  
overlapping and hard to update.

I used to use WO Modeler and it had an Entity Relationship Diagram tool  
which auto synched with the DB and drew the relationships and allowed  
you to see the model files in a visual way.

Cayenne was a off shoot of that ; if anyone knows of something similar  
for ROR that would be sweet.