电子发票识别，可识别 电子普票 电子专票

Java library for Swiss QR bill payment slips (aka QR-Rechnung)

Java library for reading and writing UBL 2.0, 2.1, 2.2, 2.3 and 2.4 documents

A Java client for the Sypht API

A library to create, read and validate ZUGFeRD compliant invoices. Available for Java and .NET

An opensource invoicing engine

Converter for EN16931 invoices from CII to UBL

OFD (open fixed layout document) is a Chinese Document Format, just like PDF. It is standardized as GB/T 33190-2016. ofdparser is a parser to parse the format according to the standard.

Xendit REST API Client for Java - Card, Virtual Account, Invoice, Disbursement, Recurring Payments, Payout, EWallet, Balance, Retail Outlets Services

Java library for creating and sending XML files through SOAP - SUNAT

Uber Invoice Maker - Create uber like invoice by uploading a CSV file. (For Education Purpose Only)

Moneybags: a cashflow management system

a library to convert numeric value to String of words in Vietnamese

Open-Source Billing And Rating Platform For Subscription

E-receipt a mobile app has following specs. You can create invoice of bill also you can send invoice to your target customer within single click. One copy of bill will be saved into your internal Storage . You can store customer's details for future transaction.

pdfInvoice is an example implementation in iText 7 for the German ZUGFeRD 1.0 digital invoice standard.

A Java application for any mobile shop to maintain stock and create Invoice

A Simple Invoicing Tool written in Java and uses SQLite to store Data.