OpenBooks

Open-source, self-hosted accounting-first ERP with a PostgreSQL-enforced double-entry ledger.

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OpenBooks is a free, open-source accounting-first ERP for project-based, multi-entity organizations, connecting invoicing, job costing, inventory, banking, and reporting on a PostgreSQL-enforced double-entry ledger. It's for contractors and multi-entity businesses that have outgrown basic bookkeeping but don't want to pay more per user or entity, self-hosted with a one-command Docker install.

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