Adempiere is described as 'ADempiere is a commons-based peer-production of Open Source ERP Applications. This project has a bazaar of Citizens which votes in a Project Management Committee every two years' and is an app in the Business & Commerce category. There are more than 50 alternatives to Adempiere for a variety of platforms, including Online / Web-based, Windows, Linux, Mac and Android. The best alternative is Odoo, which is both free and Open Source. Other great apps like Adempiere are ERPNext (Free, Open Source), Dolibarr (Free, Open Source), Akaunting (Freemium, Open Source) and inoERP (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.
ERPNext is a free and open-source integrated Enterprise Resource Planning (ERP) software developed by Frappé Technologies Pvt. Ltd. and is built on MariaDB database system using a Python based server-side framework.
From invoicing to expense tracking to accounting, Akaunting has all the tools you need to manage your money online, for free. That's right, completely free. There is no limited or trial version. No hidden charges or setup fees.
inoERP is an open source php based enterprise management system. The ERP systems contain all the required modules for running any small to mid-size businesses. The features are very similar to Oracle R12/ Fusion Application and SAP.
Tryton is a three-tiers high-level general purpose application platform under the license GPL-3 written in Python and uses PostgreSQL as database engine. It's the core base of a business solution providing modularity, scalability and security.