The base version of NexoPOS, which is a web-Based Point Of Sale (POS)
Firefly III: a personal finances manager
Get a grip on your finances
POS & Inventory System
Accounting & Best Practice Business Administration System
Free and Online Accounting Software
Company administration manager
Free & Open Source Invoice App for Freelancers & Small Businesses
Sample/Actual payroll program/book in PHP and MySQL
FreelancerBooks -Project Management for Freelancers and Agencies
PHPawn is a web-based and visual basic pawnshop program.
PHP Stock Inventory Management System
ShelterOps - Animal and Wildlife data management software
Captures time & expense by project and account; generates invoice
Restaurant Script is a Pizza Restaurant Ordering System for Everyone!