The best open source alternative to SAP is Open Mercato. If that doesn't suit you, we've compiled a ranked list of other open source SAP alternatives to help you find a suitable replacement. Other interesting open source alternatives to SAP are: Odoo, ERPNext, and Ever Gauzy.
SAP alternatives are mainly ERP Systems but may also be CRM Systems or AI Development Platforms. Browse these if you want a narrower list of alternatives or looking for a specific functionality of SAP.
AI-Engineering Foundation Framework built with AI and designed for AI. Hundreds of architectural and domain decisions are already made conventions and specs so agents arch. decisions without reinventing.

Open Mercato is an AI-engineering foundation framework that ships with hundreds of architectural and domain decisions already encoded as conventions and specifications. Built with modern technologies like Next.js, TypeScript, and PostgreSQL, it provides teams with a strong baseline while maintaining complete flexibility for customization.
The framework includes three core pillars: Security & Infrastructure (multi-tenancy, RBAC, audit trails, AES-256 encryption), Business Logic (CRM, ERP, orders, workflows, catalog management), and Performance & AI (event streaming, search capabilities, Redis caching, AI assistant integration).
Key advantages include:
Teams use Open Mercato to escape the traditional infrastructure tax, build regulated systems with field-level encryption, and maintain code ownership while leveraging pre-built patterns for CRM, ERP, and complex workflows.
Looking for open source alternatives to other popular services? Check out other posts in the alternatives series and openalternative.co, a directory of open source software with filters for tags and alternatives for easy browsing and discovery.
Comprehensive ERP solution offering integrated modules for finance, HR, sales, inventory, and more, tailored for businesses of all sizes.

Odoo is a powerful, open-source business management platform that revolutionizes how companies operate. This versatile suite of applications seamlessly integrates various business functions, providing a unified solution for organizations across industries.
Key benefits of Odoo include:
Whether you're managing finances, streamlining operations, or boosting sales, Odoo provides the tools you need to succeed in today's competitive business landscape.
Open-source ERP solution offering modules for accounting, inventory, HR, CRM, and more. Customizable and scalable for businesses of all sizes.

ERPNext is a powerful, open-source business management platform designed to streamline operations across your entire organization. This versatile solution offers a comprehensive suite of modules that cater to various aspects of your business, including:
What sets ERPNext apart is its flexibility and customizability. The platform can be tailored to fit the unique needs of businesses across different industries and sizes, from small startups to large enterprises. Key benefits include:
By centralizing your business operations on a single platform, ERPNext helps improve efficiency, reduce errors, and provide valuable insights for data-driven decision-making.
All-in-one solution for ERP, CRM, HRM, ATS, and project management to streamline your business operations

Ever Gauzy Platform is a powerful open-source business management solution that combines multiple essential tools into one comprehensive package. This versatile platform integrates:
Key benefits:
Ever Gauzy Platform empowers businesses to operate more efficiently, make data-driven decisions, and foster better collaboration across departments. Whether you're a small team or a large corporation, this comprehensive solution provides the tools you need to succeed in today's competitive business landscape.