iDempiere is described as 'Business Suite ERP/CRM/SCM done the community way. An open source tool for Enterprise Resource Planning, Customer Relationship Management and Supply Chain Management able to handle multiple organizations' and is an app in the Business & Commerce category. There are more than 10 alternatives to iDempiere for a variety of platforms, including Online / Web-based, Mac, Windows, Linux and Android. The best alternative is Odoo, which is both free and Open Source. Other great apps like iDempiere are insightly (Freemium), Teamleader (Paid), Compiere (Free, Open Source) and Adempiere (Free, Open Source).
Odoo (formerly OpenERP) is a suite of open-source business apps written in Python and distributed under the AGPL license, under the Open Core software business model. It is used by 2 million users worldwide to manage companies of all size.