The free Biller helps self-employed and small business owners in the billing. The freeware can be easily and quickly offers, create invoices, delivery notes or credits. Biller is aimed primarily at small business owners and professionals who want to handle their accounting free easily and without much training effort. The German language interface is designed with NET.Framework and VB.NET and recalls the interface of Microsoft Office. Practical: Bills exported the free helper when needed in the PDF format. Biller combines the most commonly used functions in the invoice in a user-friendly interface. The program provides separate interfaces for new plug-ins and invoice layouts. The interfaces have few restrictions, then the user interface through plug-ins can be expanded at will.