siwapp is a Web application meant to help manage and create invoices in a simple, straightforward way. It can manage invoices with different serial numbers (as rectification invoices), provide printable PDF versions of the invoices with a professional look & feel, save drafts of your invoices and continue editing them later, and automatically generate invoices on a periodic basis.
CRM+ is user-friendly, easy-to-understand customer relationship management (CRM) software for getting your company's data centralized and organized. It supports the invoicing, contact management, project management, business history, business tasks, reminders, knowledge base, and many more customer related functions. It was built using the FileMaker database engine. It is available in a single-user edition and a network-capable multi-user edition.
MEVEO is a billing system for mediation, rating, invoicing, payment, dunning, and composition. It is adapted to the following situations: batch processing of thousands of invoices per month (or much more), complex price plans, real time rating, and re-rating, automatic provisionning through an API, multi-format CDRs, and pre/post-invoicing reports.