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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.
The only reason I switched away from Vivaldi was the sluggish UI (too many things on the main thread, I guess), but I hear there have been improvements in that area. I may give it another try.
qutebrowser on the other hand seems to have limited support for addons and the builtin features are good, but not on part with what addons can give you (https://github.com/qutebrowser/qutebrowser/issues/28).
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Hence, a higher number means a more popular project.