Free and Open Source Invoicing, Expenses & Time-Tracking
Accounting & Best Practice Business Administration System
Profesionalna integracja z Krajowym Systemem e-Faktur (KSeF)
Free & Open Source Invoice App for Freelancers & Small Businesses
FreelancerBooks -Project Management for Freelancers and Agencies
its complete accounting system for small scale manufacturing companies
Mutasyon is a script can add customer, products, inventory or invoice
Captures time & expense by project and account; generates invoice
Software platform
Codeignitor PHP based system for Client management, Product management