Quick answer
The best open source ERP software for most small businesses is ERPNext, with Odoo Community and Dolibarr ERP CRM as strong alternatives. Verified 16 October 2026.
An ERP combines accounting, sales, purchasing, stock and HR in one system. For small businesses it replaces a pile of spreadsheets and separate apps. The leading open source ERPs are mature, but they need real setup, so choose carefully.
We write for small businesses, freelancers and growing teams, not large enterprises. Every tool below was checked on GitHub for license, archive status and recent activity, and prices are never quoted because they change. Our picks are based on each project's documentation and repository data, not on hands-on benchmarks, so always try a tool with sample data first. This is general information, not tax, legal or accounting advice.
Top picks at a glance
- ERPNext: Most complete free ERP for small business.
- Odoo Community: Huge app ecosystem, with edition limits.
- Dolibarr ERP CRM: Light ERP for very small businesses.
What to look for in ERP software for a small business
- Modules you need. List the processes you want to cover and check each in a demo.
- Implementation effort. ERPs need configuration and data migration. Plan weeks, not days.
- Local compliance. Tax, invoicing and payroll rules vary by country. Check localizations.
- Hosting and updates. Know who will host, back up and update it.
- Project health and license. Choose a project that is not archived, has recent releases and a real open source license. Check the LICENSE file, not just the website.
Comparison table: best open source ERP software
| Tool | Best for | License | Stack | GitHub stars | Repo updated |
|---|---|---|---|---|---|
| ERPNext | Most complete free ERP for small business | GPL-3.0 | Python (Frappe), MariaDB | 40,232 | Oct 2026 |
| Odoo Community | Huge app ecosystem, with edition limits | LGPL-3.0 (Community edition) | Python, PostgreSQL | 55,072 | Oct 2026 |
| Dolibarr ERP CRM | Light ERP for very small businesses | GPL-3.0 | PHP, MySQL/MariaDB/PostgreSQL | 7,732 | Oct 2026 |
| AureusERP | New MIT-licensed Laravel ERP | MIT | PHP (Laravel, Filament) | 12,073 | Oct 2026 |
| Axelor Open Suite | Java ERP and CRM suite | AGPL-3.0 | Java, PostgreSQL | 980 | Oct 2026 |
| Apache OFBiz | Apache ERP framework | Apache-2.0 | Java | 1,130 | Oct 2026 |
| metasfresh | Java ERP | GPL-2.0 | Java | 2,447 | Oct 2026 |
| iDempiere | Community ERP on Java | GPL-2.0 | Java | 666 | Oct 2026 |
Stars and update dates are a snapshot from 16 October 2026 and change daily. They show activity, not quality.
The 8 best open source ERP tools, reviewed
1. ERPNext
Best for: Most complete free ERP for small business
License: GPL-3.0 · Stack: Python (Frappe), MariaDB · GitHub: 40,232 stars, repo updated Oct 2026
Covers accounting, sales, purchasing, stock, manufacturing, projects, assets and CRM. Large community and an official hosted option on Frappe Cloud.
Read our full guide to ERPNext · Source on GitHub · Official website
2. Odoo Community
Best for: Huge app ecosystem, with edition limits
License: LGPL-3.0 (Community edition) · Stack: Python, PostgreSQL · GitHub: 55,072 stars, repo updated Oct 2026
Odoo Community offers many apps with a polished interface. Some features, notably full accounting, belong to the paid Enterprise edition.
Read our full guide to Odoo Community · Source on GitHub · Official website
3. Dolibarr ERP CRM
Best for: Light ERP for very small businesses
License: GPL-3.0 · Stack: PHP, MySQL/MariaDB/PostgreSQL · GitHub: 7,732 stars, repo updated Oct 2026
A modular PHP ERP and CRM that runs on ordinary hosting. Easier to set up than the larger systems.
Read our full guide to Dolibarr ERP CRM · Source on GitHub · Official website
4. AureusERP
Best for: New MIT-licensed Laravel ERP
License: MIT · Stack: PHP (Laravel, Filament) · GitHub: 12,073 stars, repo updated Oct 2026
A fast-growing open source ERP with modules for inventory, purchasing, sales and more. Young, so check maturity.
Source on GitHub · Official website
5. Axelor Open Suite
Best for: Java ERP and CRM suite
License: AGPL-3.0 · Stack: Java, PostgreSQL · GitHub: 980 stars, repo updated Oct 2026
Axelor Open Suite offers CRM, sales, accounting, HR and production modules on a Java platform.
Read our full guide to Axelor Open Suite · Source on GitHub · Official website
6. Apache OFBiz
Best for: Apache ERP framework
License: Apache-2.0 · Stack: Java · GitHub: 1,130 stars, repo updated Oct 2026
A long-running Apache project for enterprise automation. Needs experienced Java developers.
Read our full guide to Apache OFBiz · Source on GitHub · Official website
7. metasfresh
Best for: Java ERP
License: GPL-2.0 · Stack: Java · GitHub: 2,447 stars, repo updated Oct 2026
An open source ERP written in Java. Heavier to run and customize than the PHP and Python options.
Source on GitHub · Official website
8. iDempiere
Best for: Community ERP on Java
License: GPL-2.0 · Stack: Java · GitHub: 666 stars, repo updated Oct 2026
iDempiere is a community-maintained open source ERP. A good fit for teams with Java experience.
Source on GitHub · Official website
Open source vs paid ERP software
Paid cloud products usually win on polish, mobile apps, automatic bank connections and support. Open source wins on running cost as you grow, data ownership and the freedom to customize. The real cost of open source is hosting, backups, updates and your own time, so count those honestly. Several of these projects also sell hosting or support if you would rather not run a server yourself.
How to choose the best ERP software
- You want the most complete free option: ERPNext.
- You want the simplest start: Dolibarr.
- You want the biggest app ecosystem and accept edition limits: Odoo Community.
- You have Java engineers: Axelor, OFBiz or iDempiere.
Mistakes to avoid
ERP projects fail when they are rushed. Start with accounting, sales and stock, then add modules. Consider an official hosted plan or a partner for the first year.
Where to host it
All of these tools can be self-hosted. A small VPS or a web hosting plan from a provider such as Hostinger is enough to get started with most of them. Check each project's requirements first, and read our security and backup checklist before you add real data.
Need a server to host it?
Self-hosting a CRM needs a server. PHP and MySQL apps can often run on ordinary web hosting, while Docker, Node, Python or Java apps usually need a VPS. Check each project's requirements first. Hostinger offers both shared web hosting and VPS plans.
Affiliate disclosure: this is an affiliate link. If you buy through it we may earn a commission at no extra cost to you. CRMs are listed independently of any hosting partner. Learn more.
Related comparisons
- Best Open Source Accounting Software for Small Business
- Best Open Source Inventory Management Software (2026)
- Best Open Source Point of Sale (POS) Software (2026)
- Best Open Source Payroll Software for Small Business
All open source business software comparisons
- Accounting
- Bookkeeping
- Billing
- Invoicing
- Payroll
- Inventory Management
- Warehouse Management
- Expense Tracking
- Spend Management
- Accounts Payable
- Accounts Receivable
- Cash Flow Management
- Bank Reconciliation
- Purchase Order
- Vendor Management
- Point of Sale (POS)
- Time Tracking
- Quotation & Estimates
- Revenue Recognition
- Financial Reporting
- Asset Management
- Lead Management
- Sales Pipeline
- ERP
Also see our directory of 50 open source CRMs.