Axibase Time Series Database - ATSD is purpose-built for analyzing and reporting on massive volumes of time-series data collected...
QuestDB - QuestDB is the fastest open source time series database
OpenTSDB - OpenTSDB is a distributed, scalable Time Series Database (TSDB) written on top of HBase.
PipelineDB - Realtime analytics database
Spotify Heroic - Heroic time series database.
Waste Not - Open-source database of sustainable suppliers