SchemaCrawler is a free database schema discovery and comprehension tool. It has a good mix of useful features for data governance. You can search for database schema objects using regular expressions, and output the schema and data in a readable text format.

Supported databases:
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You can find SchemaCrawler in these categories:

SchemaCrawler in Database diagram / Reverse Engineering tools

SchemaCrawler in Database documentation generators

SchemaCrawler in Database documentation tools

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