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Best Free OPC and Industrial Connectivity Software in 2026

3 of the 10 OPC and industrial connectivity software ranked on listme.name match: they can be used without paying (a free plan or free version). The order uses the same scores as the full ranking.

3 products ranked Updated October 2026 How we rank Share

The ranking

  1. open62541

    Free MPL-2.0 OPC UA library in C99 that runs on Windows, Linux, RTOS and Android. It suits developers who write their own servers and clients, and it is not a configurable gateway or a client tool.

    Best for Developers building OPC UA servers and clients in C

    WindowsLinuxAndroidFree and open sourceOpen source

    77.5of 100
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  2. Telegraf

    Open-source MIT agent with OPC UA and Modbus input plugins, built for Windows, macOS and Linux. It collects metrics into time-series and messaging outputs rather than acting as an OPC server or gateway.

    Best for Open-source OPC UA and Modbus data collection

    WindowsmacOSLinuxFree and open sourceOpen source

    72.0of 100
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  3. UaExpert

    A free OPC UA reference client for browsing, reading, writing and subscribing, on Windows and Linux. It is a testing tool rather than connectivity software, and plugins need keys above set limits.

    Best for Testing and commissioning OPC UA servers

    WindowsLinuxFree

    70.0of 100
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At a glance

ProductScorePricePlatformsProtocolsLicense modelTrial
open6254177.5Free and open sourceWindowsLinuxAndroidOPC UA (IEC 62541)Open source under MPL-2.0Not needed; source is free
Telegraf72.0Free and open sourceWindowsmacOSLinuxOPC UA, Modbus, MQTT, Kafka, AMQP (plugins)MIT, open sourceNot needed; source is free
UaExpert70.0FreeWindowsLinuxOPC UA client; no device driversFree; some plugins need keysFree version, no trial