LedgerSMB

LedgerSMB is a free web-based double-entry accounting system for small and medium businesses. It covers accounting and ERP tasks like quotations, ordering, invoicing, projects, timecards, inventory management, and shipping from a browser-based UI.

It stores data in PostgreSQL and can send orders, invoices, and RFQs by built-in email with PDF attachments. Customer-facing output is customizable in templates, and supported formats include PDF, CSV, HTML, and ODF.

LedgerSMB runs with Perl 5.38+, PostgreSQL 14+, and a web server such as nginx, Apache HTTPd, lighttpd, or Varnish. It can also be set up with Docker and docker-compose for evaluation or installation, and it is licensed under GPLv2.