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https://www.postgresql.org/download/products/1-administrationdevelopment-tools/
Barman is open source, and its code is distributed under GNU General Public License 3 terms
https://www.postgresql.org/download/products/6-postgresql-extensions/
They're useful to know if specific indexes can increase performance for problematic queries, since you can know if PostgreSQL will use these indexes or not without having to spend resources to create them