Free and Open Source Invoicing, Expenses & Time-Tracking
Free Invoice & Billing Software for Windows & Linux
Accounting & Best Practice Business Administration System
Accounting system for smaller companies written in GnuCobol.
Free Bootstrap 4 admin/dashboard template
Small Business Appliance
Fullstack open source Invoicing application made with MongoDB
Free & Open Source Invoice App for Freelancers & Small Businesses
Invoice and office utilities program for customer managment
Mutasyon is a script can add customer, products, inventory or invoice
Intuitive quote, delivery note, invoice, payments management app
Free web-based invoicing primarily for Finnish companies