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Gnome-Pie
Discontinued A pie menu launcher for linux. Read the release announcement of version 0.7.2 at https://schneegans.github.io/news/2018/10/30/gnome-pie-072 Or have a look at the homepage!
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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.
If you're fine with using an external program, I think Gnome Pie can detect and change its menu depending on the currently selected window. Then maybe you could bind its options to Hotkeys in Xournal? There's also the far superior Fly Pie.
Here is the Xournal++ plugin and Fly-Pie menu files. I made around 25 or so custom icons for this, so it took me a bit longer than I expected.