Browse free open source Billing software and projects for Linux below. Use the toggles on the left to filter open source Billing software by OS, license, language, programming language, and project status.
Free Desktop book-keeping software for small-businesses & freelancers
Open Source Integrated Hospital Information Management System
Free & Open Source Invoice App for Freelancers & Small Businesses
Imagic Solution Easy to Use Windows Based Weighbridge Software
Simple and elegant invoicing solution
Easy to use, modern and reliable POS solution.
Accounting system for smaller companies written in GnuCobol.
jBilling is a web-based enterprise billing system.
Open Source Metering and Usage Based Billing API
Open Source Openbravo POS convert to Commercial Retail ERP and POS
Empower your hosting business with FOSSBilling
Free and Open Source Invoicing, Expenses & Time-Tracking
The Open Source Invoice Management Software
A super simple way to create & send invoices, receive payments online
Open-source subscription management & billing automation system
A powerful, self-hosted personal finance app that is easy to use
Captures time & expense by project and account; generates invoice
Free web-based invoicing primarily for Finnish companies
Baraza Business Management System, a product of Openbaraza