Odoo
Modular open-source ERP — CRM, accounting, inventory, eCommerce, and 30+ business apps.
LGPL-3.0 alternative to SAP and NetSuite. Self-host the Community Edition or use Odoo Cloud — integrated apps for sales, operations, finance, and HR.
ERPNext
Full-featured open-source ERP — accounting, inventory, HR, CRM.
GPL-3.0 alternative to SAP and Odoo. Double-entry bookkeeping, batch tracking, BOM, payroll, and lead management. Python/React stack with MariaDB.
Ever Gauzy
Open business platform — ERP, CRM, HRM, ATS, and PM in one stack.
AGPL-3.0 alternative to Odoo for agencies and freelancers. NestJS + Angular, multi-tenant, time tracking, invoicing, and MCP server with 323+ AI tools.
Compare SAP alternatives
| Tool | Stars | Forks | License | Self-hosted |
|---|---|---|---|---|
| Odoo | 51.7K | 32.6K | LGPL-3.0 | Yes |
| ERPNext | 35.2K | 11.5K | GPL-3.0 | Yes |
| Ever Gauzy | 3.7K | 768 | AGPL-3.0 | Yes |
SAP is enterprise resource planning (ERP) software used by large organizations to manage finance, supply chain, HR, and operations. It's powerful but comes with high licensing costs, long implementation cycles, and reliance on SAP-certified consultants for customization.
Open-source ERP alternatives cover similar ground at a fraction of the licensing cost, since you self-host and only pay for infrastructure and implementation. Migrating off SAP is rarely a like-for-like swap — expect to reimplement core business processes rather than doing a direct data migration, given how deeply SAP implementations are typically customized.
FAQ
Is there a free, open-source alternative to SAP?
Yes. Odoo, ERPNext, and Ever Gauzy are all open source and self-hostable, with no per-user licensing fees — you pay for infrastructure and implementation instead.
What's the best open-source alternative to SAP?
Pick Odoo for the broadest ecosystem of modules and integrators. Pick ERPNext if you want a single, fully open-source ERP without Odoo's mix of open-core and paid apps.
Is open-source ERP suitable for a full SAP replacement?
For small to mid-sized organizations, yes — Odoo and ERPNext cover finance, inventory, and HR out of the box. Very large, highly regulated enterprises should evaluate scalability and compliance features carefully before switching from SAP.
What are the top open-source alternatives to SAP?
Browse all open-source alternatives to SAP above, or explore the full Business & Finance category for more options.