The best open source alternative to ERPNext is Odoo, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to ERPNext and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to ERPNext are Dolibarr (Free, Open Source), Crust CRM (Free, Open Source), EspoCRM (Freemium, Open Source) and SuiteCRM (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.
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Odoo vs ERPNext opinions
Some users think Odoo is a great alternative to ERPNext, some don't.
all the features given by erpnext are included with the community download. This is a completely capped
Crust CRM is a 100% free and open-source CRM. It's fully featured and includes rich dashboards, automation rules (workflows), collaborative team messaging and much more. You can customise your CRM with the included low-code development platform.
SuiteCRM provides an enterprise-grade Customer Relationship Management (CRM) application to a global community of users and software developers. It is a robust and credible alternative to Salesforce, Microsoft and the major CRM vendors.
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.
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.
webERP is a complete web based accounting/ERP system that requires only a web-browser and pdf reader to use. It has a wide range of features suitable for many businesses particularly distributed businesses in wholesale and distribution.