StratosERP is a module set that allows you to use Drupal as a major part of your business operations in areas that Quickbooks and MYOB are lacking. The Drupal node system is used so that almost any other Drupal module can also be added to expand the power of the system. Existing Drupal modules are employed wherever possible, using Views, Gmap, Date, and Calendar modules in particular. The Stratos ERP module can act as the core of a small business, handling all aspects of it except tax reporting and employee payroll. Its features include franchises, stores, quoting/estimates, invoices, purchase orders, payment receipt, stock tracking over multiple stores with the option of tracking by serial number, job tracking, automated item/pricing import from CSV/XLS files via the Web or email, PDF generation of invoices for email, Ubercart item synchronization, POS instant login via RFID tag, and more.
phpMoneyBooks is a PHP/MySQL program that aims to be a Web-based QuickBooks replacement. It can manage bank accounts and check registries; manage customers and create statement charges; print statements to bill customers; and display profit and loss reports. The design is modular so that features can be added by any PHP/MySQL developer. With new modules, you can direct the user to a URL. Clients can log in and check their own bills and pay online, create memorized billing cycles with Auto Billing (good for recurring billing), and more.
Konik provides an easy way to create, read, and validate ZUGFeRD invoices. It features an easy and understandable API, extensive documentation with examples, logical invoice validation with JSR303, validation of invoices against ZUGFeRD profiles, validation of invoices against specific country invoice regulations, easy invoice appending or extracting in and from PDFs, and multiple PDF Carriages from different vendors.