Linux-Based Billing And Business Application Server For FREE use.
Free & Open Source Invoice App for Freelancers & Small Businesses
A super simple way to create & send invoices, receive payments online
Application for tracking customers, clients, accounts, etc. PHP/MDB2
Captures time & expense by project and account; generates invoice
Seagram Inventory is an open source inventory management application
Intuitive quote, delivery note, invoice, payments management app