SQL-Ledger

SQL-Ledger® ERP is a multi-user, multi-company, double entry account/ERP system for manufacturers, retail and service businesses. Accounts are automatically updated and forms and reports are customizable (including Invoices, Packing Lists, Income Statements, and Balance Sheets, among others). It includes Accounts Receivable, Accounts Payable, Inventory Control, Billing / Invoicing, Recurring Invoices, Purchase / Sales Orders, Customizable Taxes, Foreign Currency and other functionality.

Homepage: http://www.sql-ledger.org/