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Industrial connectivity libraries and gateways (OPC UA, Modbus) in 2026

3 commercial products, ranked by how many people read about each, or about its maker, on Wikipedia's mobile site. 30 open-source projects, ranked by GitHub stars and how recently each was worked on. FUXA leads with 5.2k stars, ahead of Dgiot. 25 had code pushed in the last three months. Most common licenses: MIT (11), Apache-2.0 (7) and MPL-2.0 (4).

Commercial industrial connectivity libraries and gateways (OPC UA, Modbus)

  1. 1
    Kepware KEPServerEX PTC

    Integration Production-ready A plant needs to pull data from a mix of PLC brands into SCADA, MES or historian systems.

    Commercial
  2. 2
    Ignition Inductive Automation

    Ignition is the universal industrial platform for SCADA, MES, IIoT and more. Connect all your data across your entire enterprise and applications.

    Framework or platform Production-ready A manufacturer or integrator wants to build plant-wide SCADA and dashboards without per-tag or per-client licensing.

    Commercial
  3. 3
    HighByte Intelligence Hub HighByte

    Architect your digital transformation and AI use cases with proven Industrial DataOps software from HighByte. Let

    Integration Usable A manufacturer wants clean, modelled machine data flowing to cloud analytics or a unified namespace across plants.

    Commercial

Open-source industrial connectivity libraries and gateways (OPC UA, Modbus)

Complete systems you can adopt 2

  1. 1
    FUXA frangoteam

    Web-based Process Visualization (SCADA/HMI/Dashboard) software

    Complete system Usable A plant or integrator wants browser-based HMI screens without licensing a commercial SCADA package.

    ★ 5.2k MIT JavaScript Active, pushed yesterday
  2. 2
    Neuron emqx

    Open source industrial connectivity server

    Complete system Production-ready You need a lightweight edge gateway to move PLC data into MQTT or EMQX.

    ★ 1.4k LGPL-3.0 C Active, pushed 5 days ago

Frameworks and platforms to build on 3

  1. 1
    Dgiot dgiot

    Open Source Industrial IoT Platform | 300+ protocols | 6-min deploy | Modbus OPC UA MQTT | 12K Stars

    Framework or platform Usable You are building an industrial IoT deployment with many devices and have staff able to operate Erlang, PostgreSQL and TDengine.

    ★ 4.9k Apache-2.0 Erlang Active, pushed 20 days ago
  2. 2
    Magistrala absmach

    IoT Platform Framework

    Framework or platform Usable You are building your own IoT service and want multi-protocol messaging and device management as a base instead of writing it.

    ★ 2.7k Apache-2.0 Go Active, pushed 7 days ago
  3. 3
    Shifu Edgenesis

    Kubernetes-native IoT gateway

    Framework or platform Usable Your edge sites already run Kubernetes and you want devices managed with the same tooling as your services.

    ★ 1.4k Apache-2.0 Go Active, pushed 7 days ago

Building blocks for your own system 4

  1. 1
    Open62541 open62541

    Open source implementation of OPC UA (OPC Unified Architecture) aka IEC 62541 licensed under Mozilla Public License v2.0

    Building block Production-ready You are writing firmware or software that must speak OPC UA and want a portable, open implementation.

    ★ 3.3k MPL-2.0 C Active, pushed 5 days ago
  2. 2
    PLC4X apache

    PLC4X The Industrial IoT adapter

    Building block Usable Your software must read from PLCs of several brands and you would rather not write each driver yourself.

    ★ 1.8k Apache-2.0 Java Active, pushed 5 days ago
  3. 3
    NodeOPCUA node-opcua

    Unlocking the Full Potential of OPC UA with Typescript and NodeJS - http://node-opcua.github.io/

    Building block Production-ready You are writing industrial software in JavaScript or TypeScript that has to talk OPC UA.

    ★ 1.7k MIT TypeScript Active, pushed yesterday
  4. 4
    Opcua-asyncio FreeOpcUa

    OPC UA library for python >= 3.10

    Building block Production-ready You need to read from or expose OPC UA data in a Python script or service.

    ★ 1.5k LGPL-3.0 Python Active, pushed 23 days ago

Integrations 1

  1. 1
    Thingsboard-gateway thingsboard

    Open-source IoT Gateway - integrates devices connected to legacy and third-party systems with ThingsBoard IoT Platform using Modbus, CAN bus, BACnet, BLE, OPC-UA, MQTT, ODBC and REST protocols.

    Integration Production-ready You run ThingsBoard and need to bring legacy or fieldbus devices into it.

    ★ 2.2k Apache-2.0 Python Active, pushed 5 days ago

All 30 open-source industrial connectivity projects

Open-source licenses

  • Permissive: 18. Use it anywhere, including in closed products. You keep the copyright notice; Apache-2.0 also grants patent rights.
  • Weak copyleft: 8. Changes to the licensed files must be shared, but you can link them into a closed program.
  • Strong copyleft: 4. If you distribute the program or anything built on it, you must release the whole source under the same license.

Languages

Java 5, C 4, Go 4, C# 4, JavaScript 3, Python 3, TypeScript 2, C++ 2, Erlang 1, Rust 1 and Kotlin 1.

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