I am looking for a small business management system written in php. I would prefer not to write from scratch. I prefer something that is working and ready. The system should have the following functions. Quotes, Orders, Invoice, Supplier, Basic inventory. Receivables, Payables, Reporting and obviously, security. The System should allow customer to view their own transactions. Opensource is fine as long as it has the functions.
The next option is to modify [url removed, login to view] as it has many of the required functions already.