可以考慮SugarCRM，這是一套open source，支援MySQL

http://www.sugarcrm.com/crm/

Web ERP System
這也是一套open source，也支援MySQL

http://www.weberp.org/HomePage

What Is webERP?

webERP is a complete web based accounting/ERP system that requires only a web-browser and pdf reader to use. It has a wide range of features suitable for many businesses particularly distributed businesses in wholesale and distribution. It is developed as an open-source application and is available as a free download to use. The feature set is continually expanding as new businesses and developers adopt it.
There have been in excess of 80,000 downloads to date∞.

Hi, since you want to have "ERP" system in place, do you take the following requirement into consideration ?

1. Do you have localization or customization requirement like double bytes in your reports and BI functions. Local tax, accounting & HR payroll requirement ?
2. Do you think support for your "ERP" system is very important to make your daily operation smoothly ?
   If so, please think the above requirements are important before you go for it. Normally, "ERP" system needs input a lot of data (PO, DO, SO, HR, Material bills and accountings ) before it can work smoothly + localization and customization are important should be taken into consideration.