Written in Qt 👍, interface quite stylish and organized, albeit here and there a tad unpolished. From what I see and what little they write it looks like an in-house tool from a $$$ company (aviation/military?) that has (within constraints) seen some love from (an) idealistic employee(s) and was then open sourced. (just my feeling, might be entirely unfactual :D)
Anyhow, the more the merrier, thanks to the authors!
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