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If you are building a UI on a platform like Qt, WPF, or a proprietary RTOS, you may not need a full framework—just the graphics to populate your buttons.

Not all free libraries are created equal. Some require attribution; others are truly public domain. Here are the best sources for industrial assets.

For PC‑based HMI applications running on Windows, Linux, or macOS, several free toolkits provide powerful graphics capabilities.

Link the fill color or visibility properties of the imported graphic to your PLC tags to create live animations based on field conditions. Conclusion

RapidSCADA is an open-source, web-based SCADA and HMI platform. It is designed to be a complete, flexible industrial automation system 1.2.38 .

(Free tier)

⁠Opto 22 provides an extensive free image library designed for their groov View HMI software, which can be exported for other uses. Modern, industrial, and IIoT applications.

Searching for "industrial" or "machine" symbols can yield a wealth of SVG files that can be imported into HMI development software.

A completely free, open-source visual studio-based HMI platform that includes a robust set of free industrial components like analog gauges, digital readouts, and tanks.