Linux-Based Billing And Business Application Server For FREE use.
Open Source Openbravo POS convert to Commercial Retail ERP and POS
Free & Open Source Invoice App for Freelancers & Small Businesses
A super simple way to create & send invoices, receive payments online
Baraza Business Management System, a product of Openbaraza
The Open Source Invoice Management Software
Application for tracking customers, clients, accounts, etc. PHP/MDB2
jBilling is a web-based enterprise billing system.
Captures time & expense by project and account; generates invoice
Intuitive quote, delivery note, invoice, payments management app