Free Desktop book-keeping software for small-businesses & freelancers
Free and Open Source Invoicing, Expenses & Time-Tracking
Empower your hosting business with FOSSBilling
Open Source Metering and Usage Based Billing API
Open-source pricing and billing infrastructure
Simple and elegant invoicing solution
Easy to use, modern and reliable POS solution.
Open Source Integrated Hospital Information Management System
Accounting system for smaller companies written in GnuCobol.
Open Source Openbravo POS convert to Commercial Retail ERP and POS
A powerful, self-hosted personal finance app that is easy to use
An Invoicing program for Auto Shops written in vba and MS-Access.
Linux-Based Billing And Business Application Server For FREE use.
Simple Invoicing program for Desktop written in vba and Access
Smart - Cash Flow & Financial Management
Display earnings in real time and log work to Excel
Reverse engineering API
A simple phone billing console-based app (C language)
QRK Registrierkassen Software für kleine Betriebe.
Creates Invoice & Quotation for Customers
A basic PHP/MySQL/HTML Billing APP. Meant for developers learning.