SolidInvoice

License: MIT


Description:

SolidInvoice is a sophisticated open-source invoicing application designed to assist small businesses and freelancers in efficiently managing their daily billing operations. With its comprehensive range of features, this elegant online platform ensures that you receive timely payments.

LedgerSMB

License: GPLv2


Description:

LedgerSMB is a free web-based double-entry accounting system, featuring quotation, ordering, invoicing, projects, timecards, inventory management, shipping and more … Directly send orders and invoices from the built-in e-mail function to your customers or RFQs (request for quotation) to your vendors with PDF attachments, from anywhere in the world with the browser-based UI. With its data stored in the enterprise-strength PostgreSQL open source database system, the system is known to operate smoothly for businesses with thousands of transactions per week. Customer visible output is fully customizable in templates, allowing easy and fast customization. Supported output formats are PDF, CSV, HTML, ODF and more.