open62541/open62541
Open source implementation of OPC UA (OPC Unified Architecture) aka IEC 62541 licensed under Mozilla Public License v2.0 observed · 2026-08-28
Health v2 · maintenance only
99/100
- Activity 99
- Release rhythm 98
- Longevity 100
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-03. Adoption (stars, forks) is never an input.
- gap_med: 7.0
- age_days: 4639
- days_rel: 13
- days_push: 7
- n_releases_24m: 31
Adoption not part of the score
3215 stars · 1453 forks observed · 2026-08-28
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 2026-08-28 · 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 | 99 |
For agents
markdown · JSON · MCP: product_card(name="open62541/open62541")
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem