SQLAPI++
Abstract Database Connector
CppDB - SQL Connectivity Library
dotConnect
Invoice Maker
Zoho Invoice
Invoice Ninja
Free Invoice Generator
Invoice Generator
Invoice.to
Invoice Template
Invoice Quick
SQLAPI++Invoice Maker is recommended for freelancers, small business owners, and contractors who need an easy-to-use invoicing solution that provides professional results without complex accounting software.
Abstract Database Connector - Abstract Database Connector is a C/C++ library for making connections to several databases (MySQL...
Zoho Invoice - 100% free online invoicing software for small businesses.
CppDB - SQL Connectivity Library - CppDB is an SQL connectivity library that is designed to provide platform and Database independent connectivity API similarly to what JDBC, ODBC and other connectivity libraries do. http://cppcms.com/sql/cppdb/
Invoice Ninja - Invoice Ninja is a free, open-source solution for invoicing and billing customers.
dotConnect - Ultimate solution for developing data-related .NET applications
Free Invoice Generator - A free invoice generator for startups