open62541/open62541

Some data may be outdated — see provenance labels.

Open source implementation of OPC UA (OPC Unified Architecture) aka IEC 62541 licensed under Mozilla Public License v2.0 observed · 2026-09-24

github.com/open62541/open62541 · homepage · C · MPL-2.0 (copyleft) observed · 2026-09-24

Health v2 · maintenance only

96/100

Activity 96
Release rhythm 93
Longevity 100

How is this computed?

round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-10-21. Adoption (stars, forks) is never an input.

gap_med: 11
age_days: 4687
days_rel: 44
days_push: 27
n_releases_24m: 30

Full methodology

Adoption not part of the score

3233 stars · 1464 forks observed · 2026-09-24

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

open62541 is an open-source C99 implementation of the OPC UA (IEC 62541) communication protocol for building OPC UA clients and servers or embedding OPC UA into existing applications. It is platform-independent with exchangeable plugins, runs from embedded systems to cloud servers, and is OPC UA certified.

Use cases

implement an OPC UA server in C
build an OPC UA client for industrial devices
integrate OPC UA communication into an embedded system
add pubsub communication to industrial automation
connect PLCs over OPC UA
port a lightweight industrial protocol stack to an RTOS

When to choose

you need a certified, royalty-free OPC UA stack in C
you target embedded or resource-constrained platforms
you need OPC UA clients, servers, or pubsub with minimal dependencies
you want a library combinable with proprietary software (MPLv2)

When to avoid

you need a high-level OPC UA toolkit in a language other than C
you want a GUI-based OPC UA configuration tool rather than a library
your project uses a different industrial protocol like Modbus or PROFINET

Facets

library · maturity stable

sdk networking middleware iot iot embedded-systems windows embedded cross-platform c opc-ua opcua iec-62541 industrial-automation pubsub client-server c99 mpl-2.0 automation industrial-protocols linux macos android

3 sources

readme: https://github.com/open62541/open62541 · fetched 2026-09-24 · ff1a3934b50e
homepage: https://open62541.org · fetched 2026-08-29 · ab4c9e9856c6
site_page: https://open62541.org/documentation · fetched 2026-08-29 · 3b7bfb7360f9

Member repositories

Repository	Role	Health v2
open62541/open62541	main	96

For agents

markdown · JSON · MCP: product_card(name="open62541/open62541")

Data as of 2026-10-19T08:05:51.212177+00:00 · Report a problem