Accounting system for smaller companies written in GnuCobol.
Open source ERP and CRM web software for business
Fast, modular open source CRM for growing businesses
Free Invoice & Billing Software for Windows & Linux
Personal finance app to keep track of cash, income, expense and budget
Accounting & Best Practice Business Administration System
uniCenta oPOS - dynamically evolving POS project
BestBooks Accounting Application Framework (BAAF)
Desktop and mobile solution for invoicing
Cross-plattform java invoicing and accounting application
A full ERP system - moved to GitHub. See full description for details.
JEE based Accounting web-application.
Expense reporting system for business
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Free PHP Codeigniter Expense Manager (management) Script
Baraza Business Management System, a product of Openbaraza
Mutasyon is a script can add customer, products, inventory or invoice
jBilling is a web-based enterprise billing system.
Web Based Multilingual Accounting Application