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libelektra
Elektra serves as a universal and secure framework to access configuration settings in a global, hierarchical key database.
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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.
There's no common permissively licensed GUI toolkit. The closest that we have is FLTK which is LGPLv2 with static linking exceptions. There's a couple of lesser known ones like Fyne (BSD 3-clause), but I haven't taken a closer look.
While I'd like to see something like this, I'm not sure if it would have a realistic chance to be accepted by most BSD users. Still I'd like to propose Elektra for that purpose. It's permissively licensed (BSD 3-clause), well thought-out and documented, very flexible and upstream would be happy to work together with the BSDs. I also like their "context-aware configuration" model. They haven't been terribly successful on Linux as each and every system component is being maintained by someone else, but on a BSD with full control over a dependable base system it has a lot of potential.