Ok, so I use osCommerce (and CRELoaded) and I want stock control and probably a general ledger connection. So where do I look and what do I find.

Store Manager by Magnetic One
is an application I have been aware of for a couple of years but not really used or in my view needed. It is not a stock control(SC) or general ledger (GL) but a method to allow windows users to update their CRELoaded system without using the web interface.

This blog provides a quick summary of 10 open source ERP / GL type solutions. I have yet to check these out.

This might work. ADempiere ERP Business Suite is an open source version of Compiere which, despite claiming as open source, has a fee for getting the source code which is pretty much an oxymoron.