Best Open Source Warehouse Management Software for Small Business (2026): 6 Tools Compared

A warehouse management system (WMS) controls receiving, put-away, picking and shipping. Most small businesses do not need a full WMS, and the inventory module of an ERP is enough. If you do need one, these are the maintained open source options.

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

• OpenBoxes: Supply chain and warehouse operations.
• GreaterWMS: Inventory and warehouse management.
• OpenWMS.org: Modular microservice WMS.

What to look for in warehouse management software for a small business

• Receiving and put-away. Check that goods can be received against purchase orders and assigned to locations.
• Picking and packing. Look for pick lists and barcode-assisted picking if order volume is high.
• Integration. A WMS is only useful if it connects to your sales and accounting systems.
• Operating effort. Microservice systems need DevOps skills. Match the tool to your team.
• 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 warehouse management software

Stars and update dates are a snapshot from 16 October 2026 and change daily. They show activity, not quality.

The 6 best open source warehouse management tools, reviewed

1. OpenBoxes

Best for: Supply chain and warehouse operations
License: EPL-1.0 · Stack: Groovy (Grails) · GitHub: 915 stars, repo updated Oct 2026

A warehouse management system designed for health supply chains, with stock, requests and inventory control. Written in Groovy.

Source on GitHub · Official website

2. GreaterWMS

Best for: Inventory and warehouse management
License: Apache-2.0 · Stack: Python, Vue · GitHub: 4,410 stars, repo updated Oct 2026

An Apache-2.0 licensed system built around warehouse and inventory management, recently rebuilt for version 3.

Source on GitHub · Official website

3. OpenWMS.org

Best for: Modular microservice WMS
License: Apache-2.0 · Stack: Java (microservices) · GitHub: 747 stars, repo updated Jul 2026

An open warehouse management system built as Java microservices. Powerful, but expect real engineering effort.

Source on GitHub · Official website

4. OCA WMS for Odoo

Best for: Advanced logistics for Odoo
License: AGPL-3.0 · Stack: Python (Odoo modules) · GitHub: 224 stars, repo updated Oct 2026

Community addons that add warehouse management features on top of Odoo. For existing Odoo users.

Source on GitHub

5. ERPNext

Best for: Warehouses inside an ERP
License: GPL-3.0 · Stack: Python (Frappe), MariaDB · GitHub: 40,232 stars, repo updated Oct 2026

Supports multiple warehouses and stock movements. Enough for many small operations without a separate WMS.

Read our full guide to ERPNext · Source on GitHub · Official website

6. Odoo Community

Best for: Inventory with warehouses
License: LGPL-3.0 (Community edition) · Stack: Python, PostgreSQL · GitHub: 55,072 stars, repo updated Oct 2026

Odoo Community lets you manage warehouses and stock moves in its Inventory app. Advanced picking features may need add-ons.

Read our full guide to Odoo Community · Source on GitHub · Official website

Open source vs paid warehouse management 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 warehouse management software

• You run a small warehouse and already use an ERP: Use the ERP's stock module.
• You manage health or humanitarian supplies: OpenBoxes.
• You want a dedicated, simple WMS: GreaterWMS.
• You have Java engineers and complex flows: OpenWMS.org.

Mistakes to avoid

Do not buy complexity you do not need. Most small businesses are better served by good inventory records in an ERP than by a full WMS. Run a pilot with one location first.

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.

Related comparisons

• Best Open Source Inventory Management Software (2026)
• Best Open Source Purchase Order Software for Small Business
• Best Open Source ERP Software for Small Business
• Best Open Source Asset Management Software (2026)

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.