Open for Business
The Apache Open For Business Project is an open source enterprise automation software project licensed under the Apache License Version 2.0. Several ERP systems are based on OfBiz, including Neogia , OpenTaps etc.
OpenBravo
Openbravo is an open source ERP solution designed specifically for the SME (small to midsize Enterprises). Developed in a web based environment.
TinyERP
Tiny ERP is a free ERP and CRM solution. The main technical features are: a GTK2 client and web interface, a distributed server,flexible workflows, an object database (on top of PostgreSQL), dynamic GUIs, customizable reports, SOAP and XML-RPC interfaces.
PostBooks
PostBooks is a full-featured, fully-integrated accounting, ERP, and CRM system, based on OpenMFG ERP Suite. Built with the open source PostgreSQL database, and the open source Qt framework for C++.
CK-ERP
CK-ERP is an open source accounting / MRP / ERP / CRM system that runs on top of multiple middlewares. It provides accounting and back office functionalities to SMEs and utilizes the underlying middleware to administer accounts/groups.
Open Source ERP - Few offerings by community
