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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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Slint
Discontinued Slint is a toolkit to efficiently develop fluid graphical user interfaces for any display: embedded devices and desktop applications. We support multiple programming languages, such as Rust, C++ or JavaScript. [Moved to: https://github.com/slint-ui/slint]
If you're happy floating on web technologies and using SVG to render graphs (or shipping some wasm locally and using webgl/canvas) then you might enjoy my project https://github.com/DioxusLabs/dioxus . It's still pretty young but we're moving quickly and rapidly building new features as people build out their apps.
Besides GTK I can recommend FLTK. It has been around for a long time and is very stable.
The most promising GUI hasn't been posted here, SixtyFPS. It's in it's early stages and not FOSS, but it's built by some ex-QT cats and has a lot of potential.