Use Qollabi with Invoice Ninja

Easy to use Business Relationship Management Software to plan, collaborate and measure indirect sales relationships with intermediaries, resellers and brokers.

Invoice Ninja is a free, open-source solution for invoicing and billing customers. With Invoice Ninja, you can easily build and send beautiful invoices from any device that has access to the web. Your clients can print your invoices, download them as PDF files, and even pay you online from within the system.