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Meridian is a Windows desktop system for shops and small warehouses: stock and inventory, purchases, sales, a scanner-driven cash desk with 20+ discount and loyalty rules, customers and documents. The database runs on your own PostgreSQL server, several workstations share it with roles and rights per employee. Installed from an MSI with a database kit and demo data. 10 seats free forever; 25, 50 and 100 seat packs are one-time purchases with a year of updates.