McObject eXtremeDB

McObject’s eXtremeDB is an embedded (less than 200 KB footprint) in-memory database designed specifically to support time-series data.

Trendalyze (February 2020)

Trendalyze describes its core capability as the discovery of motifs (micro-trends) and anomalies within time series data.

InfluxDB

InfluxDB is a time series database that has been designed that way, as opposed to a relational (or other) database that supports time series.

QuasarDB

QuasarDB is a NewSQL column-oriented, time-series, distributed database that uses a peer-to-peer approach to support QuasarDB clusters.