billing

Open-Source Business Management Platform (ERP/CRM/HRM)

Web outside of Browsers (core, site modules and applications)

Gold is Helium's approach to billing for Shopify apps. It provides a framework to build Rails apps upon.

Billing and accounting api/interface written in PHP

OVHBills allows you to get your OVH bills the easy way: PDF file for each bill is downloaded to the path given in config file; details of each bill is recorder in two tables of the database (bills and billsDetails).

Virtualmin billing, support & client management