TimescaleDB is a time-series SQL database providing fast analytics, scalability, with automated data management on a proven storage engine.
An open-source distributed time series database with no external dependencies
PingThings' PredictiveGrid™ platform offers a time series database purpose built for industrial scale deployments of high rate sensors (1Khz+).
OpenTSDB is a distributed, scalable Time Series Database (TSDB) written on top of HBase.
Graphite is a highly scalable real-time graphing system.