Wishbone POS - is a good Point
of Sale System. It can be installed in any windows platform. All the
data are saved in an SQL Database. This is a ready to use POS system.
It can generates reports according to your queries. It is easy to
customize and it has a security feature a POS system must have. This
POS system is my first non-web based
system.

PHP Sales System - This is a
Web-based Retail system for small and medium enterprise. PHP and AJAX
Scripts are used to construct this Retail system. It’s customizable and
is easy to use.

InventorySys - is a web-based
inventory system suitable for your needs. It provides necessary fields
for a good inventory system. This is made with PHP, AJAX and Javascript.

* If you want to have a copy of one of my projects, just inform me so we can talk about it…