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.
Nevitium was developed to put small business owners in control of their customer service and vendor relations. Developed by a person who has been supporting small businesses for twenty years, Nevitium is concise, simple, and powerful. It can create, track, and manage invoices and quotes. Invoice Manager and My Connections assist you with customers' invoices, payments, and purchase histories. It ships with the reports you need to calculate tax liabilities and conduct efficient product ordering. Those are just the basics; there are other tools for printing labels (inventory barcode and address) and printing checks, among others.