A PostgreSQL SQL syntax beautifier that can work as a console program or as a CGI. On-line demo site at http://sqlformat.darold.net/

Simple, easily customised trigger-based auditing for PostgreSQL (Postgres). See also pgaudit.

Audit trail with schema versioning for PostgreSQL using transaction-based logging

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PostgreSQL Unit Testing Framework

A complete authentication system built in Postgres using schemas and functions

Simple PostgreSQL extension that keeps track of changes to certain tables