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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 aren't a lot of recent variants. FrogComposband is one of the newest ones and it's reasonably popular. It pretty much just throws loads and loads of extra stuff in. It's a lot.
The other current one is Sil-Q, which is a further variant of an existing variant called Sil. I don't like it (either version) so I can't comment much, but it seems popular.
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.