An objective comparison of open-source manufacturing software: ERP, MES & more

Search for open source manufacturing software and you’ll usually see lists containing: 

1. Full ERP suites that happen to include an MRP module
2. Manufacturing execution systems (MES) that only run the shop floor
3. Development frameworks with no working system until someone builds one, and 
4. Commercial products whose source code is available to paying customers. 

A job shop that buys an MES expecting traceability still has no purchase orders. A manufacturer that picks a framework because the license was permissive discovers the first six months are a development project.

Licence type is always worth checking in the repository rather than the product's marketing, because it determines:

1. Whether you can modify the code
2. Whether you must publish changes you distribute, and 
3. Whether the vendor can withdraw your right to use it.(more on license obligations later)

Below are nine commonly shortlisted open source manufacturing systems with breakdowns of what they are, what their license permits, how far their manufacturing functionality goes, and where it stops.

1. ERPNext (as the name suggests, an ERP)

ERPNext is built by Frappe Technologies, an Indian software company founded by Rushabh Mehta, with the project starting in 2008 and its first release in 2010. It's licensed under GPLv3, and unlike several others on this list, there's no separate paid edition holding features back. Every module ships in the open-source release, including accounting, so the free version you install is the same one an enterprise customer would run.

The manufacturing module includes multi-level bills of materials for both finished goods and sub-assemblies, production planning that pulls from sales orders and current stock to build a production queue, and work orders that act as the central document, triggering material transfers, generating job cards, and running backflushing once goods are finished.

Capacity planning tracks workload by workstation, and a subcontracting workflow handles sending items out to third-party suppliers and reconciling what comes back in.

Since ERPNext is fully open source, a network of implementation partners has grown up around it, offering hosting, customization, and industry-specific tools on top of the core project. Dexciss, for example, is a Frappe-certified partner that builds vertical-specific products (including WMS and CRM add-ons) on top of ERPNext rather than owning or developing the ERP itself.

2. Odoo (ERP)

Odoo started as TinyERP in 2005 before rebranding, and today its Community edition is licensed under LGPLv3 while the proprietary Enterprise edition is available as a paid subscription.

The Community edition's Manufacturing app is open source and covers the basics: bills of materials, manufacturing orders, and work center routing. 

Odoo's Maintenance app is open source too, allowing you to track equipment, schedule preventative maintenance, and log corrective repairs in Odoo Community.

Where it gets more complicated is the shop floor because tools that give Odoo its reputation as a manufacturing platform, like the tablet-based Shop Floor app operators actually use, Quality Control Points and Alerts, PLM, and IoT or barcode hardware integration, are all in the paid Enterprise edition rather than Community.

When shortlisting systems with real-time shop-floor execution, confirm which edition you're actually pricing before assuming it comes with the open-source download.

3. Tryton (ERP)

Tryton comes from the same codebase lineage as Odoo, though the two projects have diverged completely since. It is licensed under GPLv3 with no paid edition at all, and the project is governed by a non-profit foundation rather than a company, so there's no single vendor positioned to change the terms later.

The architecture consists of a three-tier setup: a desktop or web client, an application server called trytond written in Python, and a PostgreSQL database. Manufacturing lives in the core Production module, which handles bills of materials and production orders, with a separate Production Work module adding work orders and their associated costs.

Releases follow a six-month cycle, and long-term support versions are maintained for five years, which suits manufacturers whose processes don't change often and would rather not chase every point release.

4. Carbon (ERP, MES and QMS)

Carbon is the newest offering in this list and the only one built specifically around made-to-order and job shop manufacturing rather than adapted to it. It’s built by crbnos and licensed under AGPL, with a commercial license available if you want to keep a modified fork private. It runs an "open core" model, so it’s fully usable and modifiable for free, with the AGPL's terms mainly triggered by redistributing the code or running a closed, modified version as a service for others.

What sets Carbon apart is that ERP, MES, and QMS ship as one system from the start, aimed specifically at complex assembly, contract manufacturing, and configure-to-order work. Features include nested bills of materials, full traceability, MRP, a configurator for build-to-order products, and an API-first design meant for teams who want to build their own tools on top rather than wait on a vendor's roadmap. 

However, as of this writing, accounting isn't part of the feature set yet, so manufacturers expecting a general ledger alongside production tracking will need to pair it with a separate finance system for now.

Carbon's code, roadmap, and open issues are all public on GitHub.

5. Frappe (framework, not a full ERP)

Frappe is the low-code framework ERPNext runs on, built and maintained by Frappe Technologies, and it's worth including here because you’ll see it when searching for open-source manufacturing ERPs, even though it isn't one. 

Frappe itself is licensed under the MIT license, more permissive than ERPNext's GPLv3. It’s a full-stack platform for building business applications in Python and JavaScript, built around "DocTypes" that generate database tables and REST APIs from a definition rather than hand-written code.

If a production process is unusual enough that no packaged ERP fits, Frappe is the same foundation that ERPNext, Frappe HR, and Frappe CRM are built on, and it's designed to be extended without forking the whole stack. 

6. OpenPro (ERP with manufacturing execution built in)

OpenPro has been around since 1998, built on a PHP and LAMP stack, but unlike the entries above, there’s no named license the way Tryton (GPLv3) or Apache OFBiz (Apache 2.0) do, so it's worth confirming the specifics rather than assuming a standard open source license applies.

It has MES capabilities in its manufacturing module, alongside material requirements planning, master production scheduling, and capacity requirements planning.

OpenPro also includes tools for estimating and quoting, work order processing, labor tracking, job costing, and shop floor control, built around experience in job shops, aerospace, and tool, die, and mold making, with ISO 9000, FDA standards, just-in-time, and lean manufacturing practices built into the workflow rather than added on.

7. Onfinity (ERP)

Formerly VIENNA Advantage, Onfinity is built on C#.NET, PostgreSQL, and a React Native mobile app. The manufacturing side covers multi-level bills of materials, MRP, production control, costing, and warehouse management.

The caveat here applies to a lot of "open source" options; Onfinity's community edition has a basic feature set with no support tiers attached, and the manufacturing depth shown in its marketing materials is tied to the paid editions rather than the free download. 

If it’s on your shortlist, be sure to confirm the breadth of those manufacturing features in the community edition versus behind a quote.

8. Apache OFBiz (ERP)

OFBiz has been running since the early 2000s and has been an Apache top-level project since 2006, making it one of the longest-running systems on this list. It's licensed under the Apache License 2.0, notably more permissive than the GPL-family licenses most of the rest of this list uses: derivative works don't have to be redistributed under the same license, which is key if you're weighing building and reselling a customized version rather than just running it internally.

Manufacturing runs on OFBiz's WorkEffort entity, the same underlying concept used for routing steps and entire production runs, with bills of materials, MRP, and production planning all built around it. The framework extends well beyond manufacturing into full general ledger accounting, CRM, a genuine B2B and B2C e-commerce storefront, and multi-warehouse logistics, all running on a single Java-based platform with its own entity engine, service engine, and workflow engine underneath.

9. OpenMES (as the name suggests, an MES, not an ERP)

OpenMES is the clearest example on this list of the ERP/MES distinction, because it's just an MES with no general ledger, no CRM, and no sales orders. It's licensed under AGPL-3.0, built on Laravel, Livewire, and PostgreSQL, with React being added incrementally, and designed to be self-hosted with a single Docker command.

It's purpose-built for small and mid-sized manufacturers, woodworking, metalworking, and assembly shops specifically, with a tablet-first interface for shop-floor operators. 

Production scheduling uses a drag-and-drop, Gantt-style view across weekly, daily, hourly, and monthly horizons, and every action is logged to an immutable, PostgreSQL-enforced audit trail. The system is built to run alongside an existing ERP rather than replace one. 

It integrates with systems like Odoo and SAP through CSV and XLS imports, pulls machine data over MQTT, and exposes a REST API for anything else. It also follows the ISA-95 / IEC 62264 standard for a Level 3 MES with manufacturing operations management coverage.

Which to shortlist

If every manufacturing feature needs to be included with no paid tier waiting behind it, ERPNext, Tryton, and Apache OFBiz all ship that way, and the choice between them comes down to architecture and community rather than what's gated. 

If starting free and paying once real-time shop-floor execution and quality control are actually needed sounds reasonable, Odoo's split model is a fair way to prove out the basics before committing budget. 

Recommended download: Compare the top 10 manufacturing ERP systems using our free comparison guide

In the all-too-common situation where your production process genuinely doesn't fit an off-the-shelf system and development resources are available, Carbon, Frappe, and Apache OFBiz are all realistic platforms to build on rather than just install.

And if planning and finance are already handled and what's missing is real-time visibility into what's happening on the floor right now, that's a job for a dedicated MES like OpenMES, not a reason to replace the ERP already in place.

What your license actually obligates you to do

• GPLv3 (ERPNext, Tryton) and LGPLv3 (Odoo Community) require that if you distribute a modified version, you make your changes available under the same terms, though running the software internally doesn't trigger that requirement.
• AGPL (Carbon, OpenMES) extends the same obligation to running a modified version as a network service, so if a contract manufacturer wanted to offer a customized fork of Carbon or OpenMES to other companies as hosted software, the AGPL terms would apply to that use, not just to distributing the code.
• Apache 2.0 (Apache OFBiz) and MIT (Frappe) are permissive licenses with no copyleft obligation: you can modify the code, keep the changes private, and resell the result without releasing anything back.

None of this makes one license better than another, but it changes what's actually available to you for free versus what commits you to something in return. Our open source ERP buyer's guide covers the fuller implications if licensing is a significant factor in your decision.

FAQ

Are open source manufacturing ERPs really free?

The software license is free in most cases, but implementation, hosting, localisation and support are not, and they are where the budget goes. Free licensing changes who you pay and what you can change, rather than removing the cost.

Can open source manufacturing software handle regulated production?

Batch and serial traceability is in several of these systems, which covers part of the requirement. Validation evidence, audit trails to a specific standard, electronic signatures and change control are a different matter and usually mean either a paid edition, a validated MES alongside, or documented work of your own. Establish what your auditor requires before choosing.

Do I need an MES as well as an ERP?

If you need operation-level data on what actually happened on the floor, including scrap reasons, downtime causes, operator time and lot genealogy, then yes, because ERP manufacturing modules record transactions rather than events. If you only need to know that a work order was completed and what it cost, the ERP module is enough.

How many users can these systems support? Deployment size depends more on hosting, database tuning and how much customisation sits in the request path than on the product name. Ask any vendor or partner for reference sites at your transaction volume, in your industry, and call them.

What happens if the project is abandoned?

With an OSI-approved license, you keep the right to run and modify your copy, and a fork is possible if enough users want one. With a source-available commercial product, you are dependent on the vendor's terms.

Neither case protects you from the practical problem, which is that a dead project stops getting security patches, so project health is worth checking annually.