The best open source alternative to SAP Business Suite is Odoo. If that doesn't suit you, our users have ranked more than 100 alternatives to SAP Business Suite and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to SAP Business Suite are Craftplan, ERPNext, Dolibarr and Mautic.
Open-source business application suite developed in Python, offering ERP, CRM, e-commerce, and project management, reducing software needs and synchronization costs with over 260 core modules.
Open-source ERP platform centralizes inventory management, production batching, order processing, purchasing, CRM, and scheduling for small-scale artisans, featuring cost tracking, supplier management, CSV imports, calendar feeds, global search, secure APIs, and role-based access.
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.
Dolibarr ERP & CRM is a modern and easy to use open-source web software package to manage your business (customers, invoices, orders, products, stocks, agenda, e-mailings, shipments...).
Mautic is marketing automation software (email, social, & more). Install on your own website or create a free hosted account. The simple 3-step setup process takes less than 5 minutes and you'll be ready to reclaim control of your marketing.
EspoCRM is an Open Source CRM (Customer Relationship Management) software that allows you to see, enter and evaluate all your company relationships regardless of the type. People, companies, projects or opportunities. Written in PHP and JavaScript.
Open-source CRM combining advanced features, sleek intuitive interface, secure user-controlled data management, team collaboration, user-driven customization, and freedom from vendor lock-in, suitable for small and medium-sized businesses seeking flexibility.
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.
Krayin is a Free & Opensource Laravel CRM solution for SMEs and Enterprises for complete customer lifecycle management. It automates your organization’s Sales and Marketing Operations, as a result, exponential growth in sales.
Sentrifugo is an Open Source HRMS Tool which can be easily configured to meet your organizational needs. It's completely FREE and has no hidden costs! Sentrifugo offers you a bundle of exceptional features and modules for managing your HR processes.
]project-open[ is an open-source based Project-ERP for medium and small project oriented companies.
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I think Odoo used to be good in the past when it was "really" free and fully featured, but now it cannot be used really in the context of fully featured free open-source.