ClickHouse

• Name: ClickHouse
• Status: active
• Website: https://clickhouse.yandex/
• GitHub: https://github.com/ClickHouse/ClickHouse
• Language: c++
• Backends: [ "localfs" ]
• Protocol: [ "tcp" ]
• Query: [ "sql" ]
• License: apache-2.0
• Author: alexey-milovidov KochetovNicolai 
• Contributed by: at15 

NOTE: it's actually columnar store instead of time series specific.