Open Source BSD Billing Software

FOSSBilling is a free and open-source billing and client management solution tailored for online services businesses, particularly those in the web hosting space. It delivers a suite of tools that automate the creation and delivery of invoices, track payments, manage customer accounts, and handle service provisioning, all from a centralized web interface. Because it’s self-hosted and licensed under the Apache 2.0 license, organizations have full control over their data and can customize or extend the system to fit unique workflows or branding requirements. FOSSBilling supports integration with numerous control panels and payment gateways, helping businesses automate domain management, hosting account creation, and customer notifications without manual intervention. The platform is built to be extensible, with a modular architecture that allows developers to add new features, themes, or third-party extensions.

Meteroid is an open-source, cloud-native pricing and billing infrastructure designed to support usage-based billing, subscription management, invoicing, and cost-tracking — particularly for SaaS or product-led businesses that need flexible billing models beyond flat subscriptions. It provides an API-driven billing engine: you feed Meteroid usage data from your application (e.g. API calls, storage usage, seats, feature usage), define custom pricing rules or plans, and Meteroid calculates charges, generates invoices, tracks usage, and supports cost limits or quotas. The system is written in Rust, emphasizing performance, reliability, and safety, making it suitable for production use in small startups up to large enterprises. Meteroid handles complexities like plan versioning, usage-based billing, re-invoicing, grandfathering of plans, experiments, and cost limiting — giving teams a robust billing backend without building one from scratch.

Το πρόγραμμα «Στρατιωτικές Δαπάνες» δημιουργήθηκε προκειμένου να συντάσσονται αυτόματα όλα τα δικαιολογητικά των δαπανών, να αποφεύγονται τα λάθη και να μειώνεται ο χρόνος συντάξεως της δαπάνης. Τα εξαγόμενα δικαιολογητικά σώζονται από το πρόγραμμα σε αρχεία κειμένου, τα οποία ανοίγουν από οποιοδήποτε επεξεργαστή κειμένου (για εκτύπωση ή περεταίρω επεξεργασία). Ένας έμπειρος χρήστης, χρειάζεται για να καταχωρήσει όλα τα στοιχεία στο πρόγραμμα τουλάχιστον 2 και το πολύ 10 λεπτά.

Keeps track of times entry and expenses reports of employees and contractors by projects and accounts, automatically generates invoices with details. You can print weekly time cards and expense reports by employee, project, and account. It allows you to review and approve times & expenses before generating invoices. This application is ideal for who bills their clients by time and material basis, such as IT consultants, Lawyers, CPAs, Government Contractors etc. Full featured demo site: http://tems.sourceforge.net Play with it from your browser to find out if it will fulfill your requirements, before downloading it.

NeoBill is a web-based Customer Management and Billing solution designed for small & medium business. It is developed in PHP, uses MySQL as the backend database, and is licensed under the GPL.

A small application for printing the receipts and expenditure cash documents.

jBilling is a web-based enterprise billing and rating system. It manages your subscribers with automatic invoicing (email and PDF) and payment processing (credit cards, checks, direct deposit). Robust, well documented and easy to use!

JDavide (per gli amici JD) è un software gratuito per la gestione dello Studio Legale che aiuta l’avvocato nell’espletamento delle operazioni quotidiane. Funzionalità: pratiche, agenda, formulario, atti, parcellazione, rivalutazione, ecc.

Lázaro es un sistema de gestión comercial pequeño pero flexible y ampliable (facturación y POS) para Windows y Linux.

“Nota – Il software gestionale” è un software che consente di gestire le attività contabili/gestionali di una piccola-media azienda. Il software inoltre prevede la possibilità di gestire il proprio magazzino e consente di curare molti aspetti del ciclo di vita aziendale. Potrebbe essere avvicinato molto anche ad un CRM, fornendo infatti come quest'ultimo strumenti per l'intera gestione aziendale. “Nota – Il software gestionale” è inoltre un framework che consente di sviluppare velocemente software gestionale per qualsiasi propria esigenza. Adatto sia per uso personale che aziendale è ideale per la gestione dell'attività di professionisti e piccole-medie aziende.

Evaristo is an ERP solution written in Java (2 tier), though only avaialable in Portuguese, since version 4 is fully internationalizable. It requires a PostgreSQL database in order to store the data.

This software, developed by the Muret's Calandreta allow to manage canteen and nursery registrations of children of a school (for instance, a Calandreta, bilingual school in Occitania in the South of France). The daily order is send by mail with the number of meals with and without pork for children and teachers. Then, it allow to generate monthly bills of families and record payments. More over, this software allow to manage organization of events (description, dates, registrations, ...). A translation in Occitan is now available ! Note a part of source code comes from ASTRES project (GPL help-desk software). ---- Ce logiciel a été développé par la Calandreta de Muret, école associative Occitane (Escòla Calandreta Murèth). Il permet de gérer les inscriptions des enfants à la cantine, à la garderie, d'envoyer les commandes par mail et de suivre la facturation des familles. Il permet également le suivi de l'organisation d'événements festifs via "Coopération".

Una aplicación sencilla para la contabilidad del autónomo. Facturación, control de gastos, resumen de IVA e IRPF, informes trimestrales y anuales. Desarrollado en Java

LedgerSMB is an ERP, featuring accounting (including AR, AP, and GL), quotation and order management, and more, for businesses with small to medium transaction volumes. The system has been shown to easily handle thousands of AR/AP transactions per week. Data integrity, security, quality, and responsiveness are key values for our community, both among the developers and, we hope, the users. Additionally we aim to make LedgerSMB into a platform to integrate with, or even serve as a framework for building, other applications. We highly value community contributions and aim to stimulate growth through a broad community by actively providing support and documentation.

Mini-Buchhaltung mit LibreOffice oder OpenOffice.org. Version 1.10.3 vom 9. Januar 2017 ACHTUNG: Aufgrund eines Bugs in LibreOffice Version 4.1.2 läuft das Programm nicht in dieser Version. Bis Version 4.0.1.2 funktioniert es und dann wieder an 4.1.3. Angebotserstellung, Rechnungserstellung, Lager und Kundenverwaltung, sowie Buchhaltung mit Einnahmen-Überschuß-Rechnung in einer einzigen ODS-Datei. Angebote können in Rechnungen übernommen werden. Es sind 2 Steuersätze (und 0%) in einer Rechnug möglich. Durch Verwendung der Tabellenkalkulation hat der Anwender immer die Möglichkeit seine Daten direkt zu überprüfen. Eine Portierung von Linux nach Windows oder umgekehrt ist ebenso möglich wie die Verwendung eines USB-Speichers und unterschiedlichster Rechner. (Desktop, Laptop Tablet). Die Anwendung im Netzwerk (kein multiuser) ist ebenfalls möglich.

BLacK PeaRL Billing adalah software untuk menghitung waktu/biaya pemakaian pada rental komputer atau pun warnet. memiliki beberapa fasilitas seperti , Personal, Pelajar, Game, Mengetik, Member dan paket.

BurlyCRM is a customer relationship management tool designed to aid burlesque performers and producers to effectivly manage their business and have access to important business information anywhere they will have internet access.

C.A.T. ist eine Verwaltungssoftware für kleine Kfz-Betriebe. Mit C.A.T. werden Kunden und Kundenfahrzeuge verwaltet, C.A.T. unterstützt die vollständige Rechnungslegung, inkl. Erstellung von Kostenvoranschlägen, Aufträgen und Kundenkorrespondenz

CartingManagement is an application which will provide carting service provider total trucking and hauling management system. (Not to be confused with shopping cart or GoKarting ). Carting Service Providers are the people who supply materials and usually bill the customer monthly for the total monthly weight. The material they supply can be anything from metal food sand (construction materials) etc.

CaseManager is an application to manage projects. Main-part is a document-manager but CaseManager also features time registration, address management and billing. It is tailored to lawyers needs but should be helpful for other professions as well.

This project has relocated to: https://github.com/TheScripters/client-tracker This is an application for tracking customers, clients, accounts, etc. written in PHP using the Pear::MDB2 abstraction layer. It's currently classified as pre-alpha because it's still in the process of being written the first time and is largely non-functioning (as many functions for it have not yet been written). Check News for updates. :) Anyone interested in assisting is fully welcome to apply.

Consultant Vendor Management software is an invoice based system written with consulting companies in mind to enter timesheets, generate invoices, track payments, commissions, payroll and expenses from one single location.

A PHP based donation management system for NGO. Useful to manage small member based organization with recurring donation, receipt printing and occasional ad-hoc donation for members and non-members.

FGMP - Hotel Management V1.2 supports the management of a hotel/pension, i.e. creating/canceling/editing of bookings, billing, creating/editing rooms/categories/users and storing guest data. Operating System: Windows/Linux/Mac Language: multilanguag

a free webhost billing software created from the ground up