tophermade

A very quick, and simple invoice generator. Quickly create and maintain invoices for clients, distributors, etc right from your WordPress based site.

sprInvoice

A static, fully responsive invoice template generator for WordPress.

Saurabh Chauhan

InvoiceCartel is a modern, modular WordPress plugin for managing invoices, customers, and products directly from your WordPress admin. Designed for freelancers, small businesses, and agencies, it provides a secure, user-friendly interface for all your billing needs.
Features: 
– Customer management using WordPress users (with a custom “customer” role) 
– Product management 
– Invoice creation, editing, and printing 
– Business settings (logo, signature, address, contact info, tax code) 
– Print-friendly invoice templates
<h3>License</h3>
This plugin is free software, released under the GPLv2 (or later).

InvoiceCartel

InvoiceCartel is a modern, modular WordPress plugin for managing invoices, customers, and products directly from your WordPress admin.

sprInvoice vs InvoiceCartel