OSHMI

Judgement

What it is

Complete system

What it does

Open Substation HMI: SCADA operator screens for substations with DNP3, IEC 104, Modbus and S7 drivers and Inkscape-drawn displays.

Adopt it when

You already run OSHMI at a site and need to keep it going.

Watch out

Its author has replaced it with JSON-SCADA, so new installs should start there.

Ready for

Usable

Runs as

Desktop app and self-hosted server

Built with

JavaScript, C and C++

How established

Established: started 8 years ago, latest release V6.32.

What the license allows

Use inside your business is unrestricted, but anything you distribute that includes it must be released under the same license.

Judged on 2026-11-03 from the project's README and GitHub data. The license and age lines are worked out directly.

Built from

Follow it down: OSHMI → V8 → LLVM project → runs on a microchip

How compilers were built, back to punched paper tape

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