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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.
Flameshot is quite good, but to me it's always played second fiddle to Spectacle[0]. Flameshot's purple bubble UI and strange UX workflow makes it a hard pick when native choices are just this good.
[0] https://github.com/KDE/spectacle
IMO ksnip[1] brings an amazing experience to the user as well, and I highly recommend it.
[1] https://github.com/ksnip/ksnip/
NOTE:
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Hence, a higher number means a more popular project.