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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 snap store refers to two things. One is https://snapcraft.io/. It is not open source; most websites aren't. There's nothing particularly special about it. There's an API that returns JSON (I think) listings when you do a search for snaps. And then you can download snaps from it.
Here's an example https://gitlab.com/lol-snap/lol which is Ubuntu Unity's main dev Rudra Saraswat's snap repository.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.