ERPNext - The ERP Software that helps you take full control of your business. ERPNext is both powerful and easy to use.
Dolibarr - Dolibarr ERP CRM is an Open Source software package for small, medium or large companies, freelancers or foundations to manage business. It's a PHP project built by modules addition (invoice, proposal, contact, stock, order, hr, agenda. .
Odoo - An all-integrated business app suite to unleash your growth potential.
inoERP - inoERP is an open source php based enterprise management system.
Composity ERP - Composity ERP is an integrated cloud-based enterprise resource management software to process sales, operations, financial performance and optimize inventory.
Tryton - Tryton is a three-tiers high-level general purpose application platform under the license GPL-3 written in Python and using PostgreSQL as database engine.