attached is a small patch with additional links for the "External Resources" section on the postgresql.org "Community" website. The one link there is a bit lonely.
All links are up for discussion, and I don't think any of them is somehow biased towards specific companies.
And of course if you have more resources, please post them here as well.
Regards,
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Andreas 'ads' Scherbaum German PostgreSQL User Group European PostgreSQL User Group - Board of Directors Volunteer Regional Contact, Germany - PostgreSQL Project