Open Source Perl Billing Software

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.

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.

Open billing system for homenets (in countries like Belarus, Russia, Ukraine) It's based on L2 ip source-guard feature with dhcp-snooping. Written in Perl (maybe u want to rewrite it?), using MySQL

Modularized Server Administration Control panel and user panel to replace cpanel, plesk and directadmin. Modules will include but not limited to.. Billing DNS mail web auditing and much more..

tinyHeb is a Web application for midwives in Germany to do the legal accounting with the health insurance companies. tinyHeb can produce paper and electronic bills, and meets the legal requirements of §301a, §302 SGB V, resp.