pERP is an eGroupWare ERP Group of Modules, mostly geared towards manufacturing, but very configurable. It requires eGroupWare v1.5+ and PHP 5.2+.
Full requirements at http://www.projecterp.org/mediawiki/index.php/Installation
There is currently support for:
* Fine ACL
* basic accrual accounting
* Suppliers with catalogs
* Multiple stock and manufacturing locations,
* Bill of Materials
Of note is the integration into eGroupWare:
* Home page bits for Accounts Payable and Receivable
* Addresses for Users, Suppliers & Clients are stored in the addressboook
* Most parts support linking, and some parts link automatically.